I know at least once, my T became really anxious in session, and although he sat very still and his face was calm, his breathing became very rapid and his muscles were tense. It was upsetting to me, but because I trust him, and he held still, I was not super anxious or afraid. I think that if he had started moving, I would have had a much bigger problem with it. Maybe you're just picking up on and reacting to her emotional responses?