The Östereiches Nationbildbank has an original version of this print here.
Her Wikipedia article is here.
Lady Helen wears a dress with a shallow vee, almost straight, neckline and a vee waistline in this print.
Keywords: Helen Sheridan, Sheridan family, Blackwood family, Countess, British, hurluberlu coiffure, off shoulder vee neckline, modesty piece, lace, elbow length notched sleeves, engageantes, vee waistline, full skirt, under-skirt, brooch, jeweled bodice ornament, clasps, bracelets, fan