Maiden name Mackay. Married to James Douglas (a Capt. of the Guard in 1763).
Boswell met her on January 3rd, 1763 at the Gould's in London. He didn't recognize her at first, but later that day admitted to having had a crush on her when he was 13 years old and recuperating from a disease at Moffat. Boswell also reports being with a Mrs. Douglas at the Goulds' on January 8, and at a Mrs. Douglas' with the Goulds on January 15, 1763, but Pottle identifies this latter Mrs. Douglas as the wife of Andrew Douglas.