She was the son of John Jacob Astor III who moved to England and set up a branch of the Astors in the UK.
Just a hint of her shallow vee waistline shows in this 1898 Sargent portrait of Pauline, a member of the expatriate American Astor family.
Keywords: 1898, Sargent, Astor family, straight coiffure, floral headdress, vee neckline, bertha, elbow length sleeves, shallow vee waistline, A-line skirt, wrap, muff, cloral bodice ornament, necklace, brooch