Who is Vitvitskaia from Meetings with Remarkable Men and what is their importance?

Vitvitskaia is a woman saved from a life in the white slave trade by Prince Yuri Lubovedsky. Gurdjieff escorts Vitvitskaia from Constantinople to Russia upon the request of Lubovedsky. Gurdjieff at first does not like the woman, knowing of her sordid past. He warms up to her later when they are reunited in Rome and Vitvitskaia displays a new cultured grace learned from Lubovedsky's family. She is especially talented in music and tries to capture the essence of the underlying laws. Her experiments are not successful. She dies from an illness while traveling.