From 1761 to 1793, she was a Lady of the Bedchamber to Charlotte of Mecklenburg-Strelitz, queen consort of King George III of the United Kingdom.
In 1793, as Dowager Marchioness, she became Mistress of the Robes and held that position until the Queen's death in 1818.
[1] She was born at Welbeck Abbey on 27 July 1735, the daughter of William Bentinck, 2nd Duke of Portland, and his wife, Lady Margaret Harley.
[2] His paternal grandparents were Henry Bentinck, 1st Duke of Portland and his wife Lady Elizabeth Noel (daughter of the 2nd Earl of Gainsborough).
[2] From 1793 to 1818, she served as Mistress of the Robes to the Queen, succeeding Mary Bertie, Duchess of Ancaster and Kesteven.