CONSTANCE Marten has “cowered” in her cell and refused to mix with other inmates after being handed a 14-year sentence for killing her newborn baby Victoria.
Jailed aristocrat Marten, 38, has also turned down a string of prison jobs despite being offered them by guards.
And worried officers are checking Marten around the clock amid fears she could harm herself or be attacked following the sentencing.
They have opened an ACCT – Assessment, Care in Custody and Teamwork – document on Marten to monitor her treatment and well-being.
Blue-blooded Marten, 38 – raised in one of the UK’s finest stately homes, Critchel House in Dorset – is now prisoner A9624X at tough HMP Bronzefield in Surrey.
She is serving her sentence on the jail’s Unit 4 alongside killers including ex-nurse Lucy Letby and tragic 10-year-old Sara Sharif’s Mum Beinash Batool.
And a source said: “She has reacted to the sentence very badly and thought she would get off much more lightly.
“Since returning to jail from the Old Bailey, Constance has basically cowered in her cell and tried not to come out.
“She knows she is a target because of her high-profile and notoriety.
“The staff have offered her a few jobs that would be considered plum roles inside – including as a cleaner, in the library and the kitchen.
“But she has turned them all down and won’t do anything. This is probably because she doesn’t want to mix with others.
“But if you are the librarian, for example you get the pick of books and DvDs or you’d get extra food in the kitchen.
“These are incentives most people would give their right arm for but she isn’t interested.
“She has also asked for a move off the unit so she is away from child killers like Letby and Batool.
“She thinks her crime is much less serious than theirs and views them as killers – although that’s exactly what she is.
“It has been explained to her that she is in the same category as them, and would be in much more danger on a different unit.
“The severity of her crime and her sentence does not seem to have sunk in and she is a bit deluded.
“Constance will not engage at all.
“Officers are monitoring her really closely, which they have to do under the terms of the ACCT and trying to ensure she doesn’t come to harm.
“They have to come up with a post-sentence plan for her but it is really difficult because of her behaviour.”
She knows she is a target because of her high-profile and notoriety.
Marten and her boyfriend Mark Gordon, 51, got 14 years each after being convicted in January after two trial that cost taxpayers millions.
During the sentencing, Marten argued with court officials after they stopped her passing notes to convicted rapist Gordon.
Marten – who, like Gordon will have to serve two-thirds of their sentence – is planning to appeal her conviction.
At their first trial they were convicted of concealing the birth of a baby, child cruelty and perverting justice.
They were found guilty of gross negligence manslaughter in July after a second trial.
The pair went on the run with fifth child Victoria in freezing conditions after their first four kids were taken into care.
The tragic tot’s decomposed body was found in a Lidl bag for life in a Sussex allotment in January 2023 after a nationwide manhunt.
A spokesperson for Sodexo, which runs HMP Bronzefield, said they could not comment on individuals.
Timeline of baby ‘killing’ – how couple evaded cops

CONSTANCE Marten and Mark Gordon allegedly sparked a 54-day manhunt across the UK after vanishing with their baby Victoria.
Here’s how the pair’s journey began…
December 20, 2022
Marten and Gordon booked into a holiday cottage in Northumberland, with the rental due to end on Boxing Day. The owner told jurors he found the property in “something of a state” on December 28.
December 24, 2022
The couple claim their baby daughter was born this day but this has been disputed by prosecutors.
December 28, 2022
Their Suzuki broke down on the M18 motorway so a recovery driver took them to a nearby Sainsbury’s. There was allegedly no sign of the baby but the back and side windows of the car had been blocked by clothing.
January 4, 2023
Marten and Gordon checked into the Ibis hotel at the Lymm Services in Cheshire then later the AC Hotel in Manchester.
January 5, 2023
The couple’s Peugeot 206 catches fire on the M61 motorway in Greater Manchester. Police launch an urgent probe after finding placenta, burner phones and Marten’s passport, jurors were told.
She and Gordon are taken to a Morrisons store in Bolton by a member of the public before being seen on CCTV at the nearby Bolton Interchange station.
The couple allegedly use Marten’s trust for a taxi to Liverpool, then a £400 cab to Harwich in Essex.
Cab driver Ali Yaryar, who picked the couple up from Liverpool, told the court: “I think the baby had no clothes”.
January 6, 2023
The couple arrive in Harwich and check into a Premier Inn at around 3am. They later move to the Fryatt Hotel, where they paid in cash, it was said.
January 7, 2023
Marten and Gordon travel by taxi to Colchester then to East Ham in London. The couple allegedly buy a buggy from Argos then grab another cab to Whitechapel.
They ate in a Brick Lane restaurant then dump the new buggy – choosing instead to keep Victoria in a Lidl bag, jurors heard.
January 8, 2023
The couple spend £475 on a taxi from Hornsey to Newhaven in East Sussex and walk to the South Downs National Park.
January 9, 2023
Both Marten and Gordon claim baby Victoria died on this day – making her 16 days old, the court was told. It is said there is no way of knowing this for sure.
January 12, 2023
Marten is captured buying snacks and petrol with cash but there was no sign of the baby. Prosecutors say she bought the fuel to cremate the baby but changed her mind.
January 16, 2023
Marten and Gordon are seen setting up a tent in Stanmer Park Nature Reserve in the South Downs despite the cold weather.
February 16/17, 2023
The couple are spotted near Hollingbury Golf Course in rural Sussex allegedly pushing a buggy with no baby. Their tent is later seen in Coldean Lane in Brighton
A driver sees the pair walking towards Stanmer Park with something under Marten’s puffer jacket, the court heard.
February 19, 2023
Gordon and Marten are allegedly seen in their tent in the park with a very young baby with a “wobbly” head. Jurors told the baby had no socks, blanket or hat on.
February 27, 2023
The couple are arrested in Hollingbury Place in Brighton but do not reveal Victoria’s location at first, it is said.
March 1, 2023
Tragic Victoria is found dead in a Lidl bag covered in rubbish inside a disused shed “like refuse”, the court is told.