I can find nothing about her.
From www.artscroll.ru; I made the dress as white as I could and the dog became unquestionably an Irish setter - if the recoloration is correct.
Lady Caroline's dress shows the simpler French style has landed in and conquered Great Britain.
Keywords: 1795, Hoppner, Caroline Harris, British, straight coiffure, headdress, chemise, trapezoidal neckline, criss-cross bodice, vee décolletage, lapels, ruffles, elbow length tight notched sleeves, waist band, natural high waistline, close skirt