1755 Marie Kunigunde of Saxony, Abbess of Thorn and Essen by Pietro Antonio Rotari (Gemäldegalerie Alte Meister, Dresden Germany)
Her German Wikipedia article is here.
Marie Kunigunde's dress is a clone of Marie Apollonia's, just in a different color.
Keywords: 1755, Rotari, Marie Kunigunde, Princess, Wettin family, German, curly coiffure, jeweled headdress, scoop neckline, revers, three quarter length tight sleeves, engageantes, lace, panniers, over-skirt, ruching, purse, neck band, scarf, earrings