I cannot find anything about her. For all I know, she may have been born in 1801.
From Wikimedia.
Countess Yelizaveta wears a sheer bonnet with an inner and outer layer, an almost Renaissance ruff, and full sleeves.
Keywords: 1801, Yelizaveta Musina-Pushkina, Countess, Russian, curly coiffure, bonnet, chemise, modesty piece, straight neckline, bodice, square neckline, lace neckline ruff, quarter length upper puffed tight sleeves, waist band, Empire low waistline, necklace, earrings, order bows, lace wrap