I cant believe so many people posted replies!!! Obviously just ask her... as many people before you did tell you! but if you want another way... show her what you will be wearing at you homecoming! then ask her if its ok if you wear the same at her(just assuming that she is going with you),if she says yes then your in! If she wanted to go with someone else, she might just feel bad enough to go with you any ways. If she tell you she's not going with you dump her! Problem solved easy and Slick!