Try involving your daughter in some new activities, such as a soccer team or scouting group, where she may need to learn new things and may not be the best. Encourage her to try, but let her see that she can have a good time even if she can't kick the ball perfectly and that none of the other children can either.
Talk with her teacher and school counselor to get suggestions for other ways to let her try new things. Although perfectionists usually do well in school, it's a tough way to go through life.