According to her article in the peerage, this Lady Anne was the daughter of Lady Anne Cecil. She did not bear children, living to about 22 years.
From the-athenaeum.org. Also posted to the “Casual” Dress - 1641 to 1683 Album here.
Lady Anne is sumptuously dressed in tan satin with a white chemise beneath in this Lely portrait.
Keywords: 1652, Lely, Anne Percy (1633-654), Anne Stanhope, Percy family, Stanhope family, Countess, British, proto-hurluberlu coiffure, necklace, chemise, modesty piece, elbow length under-sleeves, cuffs, fitted bodice, brooch, elbow length split puffed over-sleeves, clasps, vee wistline, close skirt, wrap