Her article in thepeerage is here.
From www.artscroll.ru.
Lady Georgina appears to be wearing double sleeves with her simple French-influenced dress. This is not revolutionary France so she wears a gold waist band and gold trim on her handkerchief. Her high coiffure is also ancien régime.
Keywords: 1792, Hoppner, Georgina Lennox, Countess of Bathurst, Lennox family, Bathurst family, Countess, British, high curly coiffure, ribbon headdress, scarf, fringe, elbow length close over-sleeves, long tight under-sleeves, waist band, natural waistline, close skirt