While I think stage work is good training for actors, I don't think Sasha would even consider it because she would want a lead part, and at this point she is incapable of handling a major acting job. I don't think she'd be offered a major role even in repertory company, and anyway, it wouldn't pay enough for her to even consider it.
She doesn't have a good enough voice for stage work, anyway. She needs extensive voice and speech training (and that will hold her back in movies, too). Her voice is too nasal, and she has an annoying tongue-thrusting habit when she talks.