This girl is in my head all day!?

Flat out--ASK HER!! you'll never know where you stand if you don't ask. she may have some mixed feelings of her own towards the situation since you both decided to remain friends. maybe she really wants more and is unsure of how to tell you that. or maybe she's afraid that you'll expect more out of her and your friendship if you attend the dance together only as friends. i deffinately think you should tell her how you feel about her and be honest. if she knows that you're sincere, she'll give you her heartfelt answer. give it a shot! ask her! you've got nothing to lose except your mind from wondering and never asking! go for it dude and good luck!