Heather Herbert was reported to police over an online post on Bluesky following the politician's death last week.
It was made ahead of the 78-year-old's death being announced as a suspected murder.
Police Scotland initially said "no criminality" had been established in relation to the social media post but then said "additional enquiries" were being carried out.
In an update on Thursday, a force spokesperson said: "We received reports on Saturday 11 July 2026 relating to a post made online.
"Following further assessment, a 50-year-old has been arrested and charged in connection.
"A report will be submitted to the Procurator Fiscal."
Herbert, a web developer at the University of Aberdeen, is also being investigated by the institution.
Professor Peter Edwards, principal and vice chancellor, previously said: "We are aware of the incident and the concerns that have been raised and are looking into the matter as a priority."
Ms Widdecombe was found dead at her home in Devon on Thursday 9 July.
Police believe the former Conservative minister turned Reform UK spokeswoman was attacked at around 12.30pm on the Wednesday - nearly 24 hours before her body was discovered with "serious injuries".
A 28-year-old white British male remains in custody following his arrest at the weekend.
He is being held on suspicion of the commission, preparation, or instigation of acts of terrorism, as well as on suspicion of murder.
Herbert's Bluesky account currently shows as being "suspended".
Herbert, a transgender woman, stood for Scottish Labour to contest the Aberdeen Donside constituency in the 2021 Scottish parliament election, and for the Scottish Greens for Aberdeen City Council's Kincorth/Nigg/Cove ward in the 2022 local government election.
Sky News has tried to contact Herbert for comment.
It will be illegal to sell energy drinks containing more than 150mg of caffeine per litre to anyone under 16 across all retailers, including online, in shops, restaurants, and cafes.
Politics latest: Zelenskyy 'afraid of changes' as Starmer bows out
Energy drinks will also be banned from all vending machines, to prevent under-16s from buying them there.
One energy drink can contain the same amount of caffeine as two coffees or four cans of coke, with up to a third of children in the UK consuming at least one energy drink every week, particularly boys.
Tea, coffee, and lower-caffeine soft drinks - such as Coca-Cola and Pepsi - are not affected.
But drinks that currently breach the limit and would be part of the ban include Red Bull, Monster, Relentless, and Prime. They already carry warnings stating they are not recommended for children.
Major supermarkets have already voluntarily stopped sales of the drinks to youngsters, but the Department of Health said research suggests some smaller convenience stores are still selling them to children.
The ban will be enforced by trading standards.
Public health minister Sharon Hodgson said: "We know about the damage to young people: affecting their sleep, their concentration in class, their behaviour."
The government confirmed their intent to implement a ban last autumn and launched a 12-week consultation.
Hodgson said ministers had heard "from so many parents and teachers across the country, they see the difference when the kids are 'wired' when they're on these high caffeine energy drinks, but it was perfectly legal.
"Well now we're empowering parents and teachers and shopkeepers to say 'no, you don't have to sell these to children under 16 anymore, they're banned'."
Labour committed in their 2024 manifesto to banning the sale of high-caffeine energy drinks to under-16s, as well as banning the advertising of junk food to children.
Theresa May's Conservative government also ran a consultation on banning the sale of energy drinks for children in 2018, although a ban was never implemented.
An estimated 100,000 children in England drink high-caffeine energy drinks.
Some energy drinks have gained popularity among young people in recent years, with sales of the viral drink Prime skyrocketing after being promoted by YouTubers KSI and Logan Paul.
Marwan Jumaa, 20, who is said to pose a threat to himself and others, absconded after being transferred from a secure hospital facility to North Manchester Hospital for medical treatment on Tuesday evening.
Jumaa, described as black, of skinny build, with short dark hair, and about 5ft 10ins tall, is serving a sentence for attacking two women.
Court records show that in January this year Jumaa pleaded guilty to three offences at Woolwich Crown Court in south east London.
The offences were assaulting an emergency worker, a police officer, the robbery of a woman and inflicting grievous bodily harm on a second woman, all committed on 17 July last year in London.
Jumaa had been held at HMP Belmarsh in March and sentenced for the offences in April this year.
Police issued an urgent appeal for any information on his whereabouts and asked the public not to approach him but call 999 immediately.
He is believed to have links to Bury, Prestwich and Crumpsall in Greater Manchester and Leeds and London.
Greater Manchester Police (GMP) are asking the public to help find him.
Read more:
Under 16s to be banned from buying energy drinks
Henry Nowak's killer confessed days after murder
Detective Chief Inspector Abigail Cronin, of GMP, said: "We are urging anybody to come forward who may have information about Marwan's whereabouts.
"I recognise that this may heighten concern within the community. However, I want to assure you that we have officers working around the clock to find Marwan and return him to hospital as soon as possible.
"If sighted, do not approach him, please call 999 immediately."
Courtney Gartshore, 28, had denied the culpable homicide of three-month-old Dahlia-Rose in Peterhead, Aberdeenshire, in September 2023.
Detective Inspector James Callander said: "Children are defenceless and should be protected.
"The death of any child is particularly harrowing, but a child's death at the hands of a parent is incredibly disturbing."
Police Scotland said officers received a call from the Scottish Ambulance Service alerting them to the death on 30 September 2023.
An investigation was launched, with Gartshore subsequently arrested and charged in November 2023.
Gartshore went on trial this month at the High Court in Aberdeen and was found guilty on Thursday.
She was convicted of culpably and recklessly causing Dahlia-Rose to be subjected to significant and sustained heat from the hairdryer on her head and body while the child was in her sole care.
The charge said the girl's injuries were so severe that she died as a result.
Gartshore will be sentenced on 14 August.
Read more from Sky News:
University worker charged over Ann Widdecombe death comments
DI Callander said: "Everyone involved in this investigation was deeply affected by the circumstances of Dahlia-Rose's death, but our job is to uncover the truth and ensure that the person responsible is brought to justice.
"I would like to express sincere thanks to everyone who supported what was an incredibly difficult and sensitive enquiry."
He added: "I also want to acknowledge the local community for their patience, understanding and support throughout this investigation, particularly those who came forward with information, whose cooperation has been invaluable in helping us establish the truth and secure this conviction."
Ellen Roome, whose 14-year-old son Jools Sweeney died in April 2022, said she hopes it will be a "turning point" in making the "online world safer for every child".
A 23-minute inquest into his death in September that year recorded a narrative conclusion after hearing no live evidence, but on Thursday, two senior judges quashed the original conclusion and ordered that the inquest be reopened.
Speaking after Thursday's hearing in London, Ms Roome said every bereaved family "deserves to know that every possible avenue, including a child's digital life, has been properly investigated.
"We hope this is a turning point, not only in finding the truth about Jools, but in making the online world safer for every child."
Social media companies "must do everything in their power to stop children dying in the first place," she said, adding that "no parent should ever have to bury their child because dangerous content was allowed to reach them".
Ms Roome, who took legal action against the senior coroner for Gloucestershire said the ruling means a coroner can now examine Jools' digital life using legal powers that did not exist when he died.
The legal system "has finally recognised that there are questions which deserve to be answered," she said.
New evidence has come to light over the role of social media in Jools' death, Ms Roome's lawyers told the hearing, while a "number of lines of inquiry" had not been pursued.
In written submissions, Harry Lambert representing Ms Roome, said some of these concerned "the role of social media, and of TikTok specifically".
Other lines of inquiry did not concern TikTok, including that Jools, from Gloucestershire, had been contacted by a fraudulent Instagram account operated by an African crime gang shortly before his death, and that evidence from his phone found a "possible attempt at extortion or 'sextortion'".
Mr Lambert said that Ms Roome "seeks only the truth about how her son died, wherever the evidence may lead".
#Lord Justice Warby, sitting with Mrs Justice Heather Williams, said a new inquest was "desirable in the interests of justice", as it was "now clear that there are various potential lines of inquiry" that had not previously been considered.
Read more:
Hackers jailed for TfL cyber attack
Falklands banner condemned
Star's cause of death confirmed
The judge also it was "simply not possible to know at this stage whether the same conclusion will be reached after appropriate investigations", and that it would be for the coroner conducting the new inquest to decide its scope.
The coroner and TikTok did not oppose the bid to reopen the inquest.
Ms Roome, who attended the hearing, wept as the judges handed down their ruling.