The expressions would bother me, too. In fact, when one of those popped up on my therapist's face during a very difficult session, I asked her to please stop. At the time, I thought it was practiced and not real, but on reflection I think I just couldn't bear having someone see me like that and respond in a way that made me feel even more vulnerable; any kind of response like that is excruciatingly painful.

I would definitely tell her how you feel about her (and about the facial expressions).