The Alexander Palace Time Machine Discussion Forum had this posted to forum.alexanderpalace.org/index.php?PHPSESSID=387178f5bcf11d931fcff34063ecbd3a&topic=260.0;nowap by Nick_Nicholson on 27 April 2004 about her, "Molchanova, Ekatherina Ivanovna (1758-1809), daughter of collegiate councillor Ivan Yakovlevich Molchanov. In 1764-1776 studied in Smolny Institute, which finished with major gold medal. In 1776, was appointed a maid of honor to Grand Duchess Maria Feodorovna, then to Catherine II. In 1780, married S. A. Olsufyev, later general-major.”
From to-world-travel.ru/rest/русский-музей-екатерина/. Color adjustments made to make the dress whiter. Also posted to the Russian Style from 1715 to 1789 Album here.