Oversensitive child?

Well, I think the last thing you want to do is quit the tumbling cles because that will only reinforce your child's feeling that she isn't "good enough" Keep going and you might see a change. When she runs to you, don't coddle her or soothe her, just say, "You only need to have fun trying. I know you can do that. Go back to cl now". Don't over-praise her efforts either or she will become self conscious and feel like she has to "live up" to her previous effort- like a fear of success. Just say good job without going overboard.