My therapist has had a few off days where she seemed sad and tired, but I just made the most of the session anyway, figuring she can still do her job. It would bother me big time if she ever told me I was looking and coping worse as therapy progressed, or if she minimized my gains as "trying." If this is unusual for her, I'd let it go. But if it's a pattern, I would definitely let her know how that was affecting me and take it from there.