I think my daughter is stressing too much

It sounds to me like your daughter is anxious to be perfect and has a low tolerance for failure.  As her mother one of the most important messages you can share with her is that she need not be perfect, nor is it necessary.  As a matter of fact, failure and making mistakes are only opportunity to learn and grow.  Give her permission and more importantly she needs to give herself permission to be a perfectly flawed human.  It may be a good idea to see a therapist to help her learn how to reframe some of her negative beliefs so she can form healthier thinking habits. Warm wishes.