Meghan Markle's mother Doria is reported to have made secret visits to the UK to comfort her daughter in the wake of her father's damaging outbursts.
Ms Ragland, who lives in Los Angeles, made the trips after repeated criticism from Thomas Markle that he had been 'cut off' by his daughter.
The Mail on Sunday understands that on one occasion – in July – the social worker stayed with Harry and Meghan at their Oxfordshire cottage, reports Daily Mail.
A source said: "The visit was totally under the radar… Doria supported Meghan throughout a lot of the ordeal with Thomas."
Harry and Meghan have spent much of the summer at their "safe haven" house on the Great Tew Estate.