A genealogical sketch of her is here.
From Wikimedia; cracks filled in and some spots filled in with Photoshop and shadows filled in.
Anna Stroganova poses with a coat half off of a dress with a probable vest bodice with the neckline area filled in by a fichu. The Revolution hasn’t happened.
Keywords: 1790, Voille, Anna Sergeyevna Trubetskaya, Trubetskoy family, Stroganov family, Baroness, Russian, bouffant coiffure, coat, collar, lapels, long close sleeves, fichu, vest bodice, waist band