Her genealogical sketch is here. She was born in Vilnius and died in Warsawa. Poland and Lithuania were combined in a Polish-Lithuanian Commonwealth from 1569 to 1795.
From pinterest.com/pawerychlik/świetliste-oświecenie/; used Photoshop to remove flaws in face and in background and spots in background and also enlarged by half.
I do not know what the gold band is - the edge of a jacket? A band draped around her neck and bodice?
Keywords: Joanna Sapieha, Joanna z Sułkowskich Sapieżyna, Sułkowski h. Sulima family, Sapieha family, Polish, high straight coiffure, jeweled feathered floral hair ornament, earrings, choker neck band, bodice, lace modesty piece, trapezoidal neckline, floral bodice ornament, jacket, lapels, tassels, order bows, close sleeves