Ms Cohen, nicknamed "Samantha the Panther" for her feisty attitude used to be one of The Queen's most trusted aides before moving to work for Prince Harry and his wife.
They added: "They will definitely stay in touch and Amy will be on hand for any advice and help that is needed in the future".
The duchess teamed her coat with a matching dress, her classic Aquazzura Deneuve bow pumps and her black satin Givenchy clutch bag.
Meghan also bid farewell to her PA Melissa Touabti who quit after just six months in the job and Meghan's bodyguard also quit in January.
Royal biographer Robert Jobson claimed in his book, Charles At Seventy, that Meghan's wedding preparations were so stressful that Harry became "petulant and short-tempered" with members of staff.
"Her job was highly pressurized and in the end it became too much".
Amy was always by Meghan’s side during royal engagements
Meghan hasn't always steered clear of social media. "Please join us is welcoming Her Royal Highness to #TeamQCT", the organization wrote.
Meghan's ring, designed by Harry, was made using two diamonds from Diana, Princess of Wales's personal collection and a central diamond sourced from Botswana.
Prince Harry has definitely evolved since he and Meghan Markle first met in 2016, with Meghan encouraging him to pick up plenty of new interests.
At the time, multiple reports suggested Meghan's "difficult" behaviour had caused a strain within the royal household.