How does she feel about you? How is your energy together? How compatible are you? Are your friends friends with her and her friends? Do you have a history of asking people out, or would this be an unusual thing for you? What's your social standing at school? What's her social standing at school? What are your intentions beyond prom? What is your crush based on? Why do you describe it as a crush and not as love?

If you can get me this data, I'll make a recommendation.