Lady Gabriella Windsor's friends are said to be rallying around the royal after the death of her husband in February.
Thomas Kingston was found dead at the age of 45 at his parents' home in The Cotswolds on February 25.
On Tuesday, Lady Gabriella, who married Kingston in 2019 at Windsor Castle, turned 43 years old.
In recent months, the royal left the Notting Hill home she shared with Kingston and moved into Kensington Palace with her parents Prince and Princess Michael of Kent, according to reports in The Daily Mail.
Lady Gabriella Windsor has moved back into her parents' house, according to reports
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One of her friends told the publication: "They wanted Ella to be with them, and she didn't want to be alone in the home she shared with Tom.
"All of us are rallying around and she's going to be OK."
Kingston died from a "traumatic head wound", an inquest heard in March.
A gun was found near his body in an outbuilding at his parents' home in The Cotswolds.
Thomas Kingston died in February at the age of 45
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Kingston's death was not being treated as suspicious, and it was confirmed that no one else was involved.
The coroner's court was told: "His father went out to walk the dogs.
"On his return, Mr Kingston was not in the house.
"After approximately 30 minutes his mother went to look for him."
Thomas Kingston and Lady Gabriella married in 2019
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Katy Skerrett, the senior coroner for Gloucestershire, added: "His father forced entry into a locked outbuilding.
"Mr Kingston was found inside with a catastrophic head injury.
"A gun was present at the scene. Police are satisfied the death is not suspicious."
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King Charles and Queen Camilla said Kingston was 'a much loved member of the family'
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Announcing his death in February, Buckingham Palace described Kingston as "a much loved member of the family" who was being mourned by King Charles and Queen Camilla.
Lady Gabriella paid tribute to her husband in a joint statement with his family, describing him as an "exceptional man who lit up the lives of all who knew him",
She added that her husband's death was a "great shock to the whole family".
