Olga's Gallery has this writup about the portrait, "Levshina, Alexandra Petrovna (1757-1782), daughter of Premier Major Peter Ivanovich Levshin and Tatyana Ivanovna, née Princess Koltsova-Masalskaya. She studied in the Smolny Institute between 1764 and 1776, graduating with a major gold medal. In 1778, she was appointed maid of honor to Catherine II. In 1780, she married Prince P. A. Tcherkassky, Captain of the Izmailovky regiment. She died in Moscow and was buried in the Donskoy Monastery."From bg-gallery.ru.