Ask her if she can give you some advice...privately and after you and she step away from the crowd, ask how you could ask a really nice girl out for dinner, movie, whatever and when she tells you, repeat the answer back and ask her out. She'll think it was a cute idea and might even say yes.
Firstly:do you know if she likes you? And does she know you like her?(please answer)think of the posotives.man up.you should dedicate her a song,thats a cute way.if shes spanish dedicate a song called mi vida eres tu by el dragon or estoy enamorado by arath de la torre.or just ask her out if you have the same church or when you got the chance.MUCHO SUERTE MEANING LOTS OF LUCK!