I think she played Masha out on Long Island (perhaps Sag Harbor?). I always liked her as an actress, and she was very good in some comedies. I have a feeling she'd have been excellent as Masha, especially as someone who lived through all the highs and lows of being a movie star.
YES, I saw that production with Sean Young as Masha, at the Engeman in Northport, and I thought she gave an excellent performance. I also liked the overall production better than The New York Times reviewer (see link).