Wikipedia has a Russian-language list of Ladies of the Russian imperial court here. Another version of this photo and some supporting information appear in that list. I can find nothing else about her. Her husband, V. N. Voeikov, was a military official. According to that list, she was Maid of Honor to Tsaritsa Maria Feodorovna. The date is that given in the list.
From the lost gallery's photostream on flickr.