I can see both sides, as I am both a teacher and a mommy. :) Yes, I think you might be a little sensitive, and there might be something in what the teachers say that is worth listening to. Not that she has any of the problems they might have mentioned, but that if she is not acting like the child you know her to be, then something might be going on. Perhaps she is not adjusting as well as hoped. Usually, if we are hesitant to tell parents that their child is doing well, it is because something is not quite there in terms of their comfort level in the classroom, for whatever reasons this is the case.
That being said, it sounds like the teachers did not handle this very professionally. You don't just go up to a parent and play a diagnosis game. Yes, it is okay to recommend some professional opinions if there are problems that seem more than the teacher can handle in the classroom, but it is not okay to instill fear in a parent's heart and give no sense of caring and love for the child. As a professional educator, you know to give positive reassurance to a child and the family transitioning into a new school environment, and if there are ever any problems, there is a way to say things in a constructive manner, and not where it would make you as a parent feel uncomfortable. I hope you understand what I mean. i think your daughters' teachers learned from this experience that to build good relationships with the parents, you need to observe the positive in the child, no matter what else is going on.
If I were you, i would ask your daughter about her day, and get to know other parents and their feelings about your daughter's teachers. Be in tune with your daughter's moods when she gets home from school, and see if this is really the best fit for her socially, emotionally, and academically. Best wishes!! xo.