I cannot find out much about her, except she is probably the daughter of Gustave-Caroline of Mecklenburg-Strelitz.
Christie's had this auction note, "Ulrike Sofie, Princess of Mecklenburg-Schwerin (1723-1813) small bust length, wearing a light blue dress with lace chemise and veil, pearl necklace, earrings and a wig." Her tall coiffure is not spread out as coiffures would later. I am going to call what they call a "chemise" a "fichu."
Keywords: Lisiewski, Princess, Mecklenburg family, German, high coiffure, veil, vee neckline, fichu, ruffles, lace, bows, tight sleeves, necklace, earrings, clasps, jeweled crucifix