If you can't date, then wtf difference does it make? It's not like she's just gonna come over to blow you while you play Xbox, lol!
Ask her what you should do and why can't you date?
Is she the one or is she the Boss...and if you can't date why is this a big problem?
If she does indeed like you, maybe you were rejected because she wasn't sure back then? or maybe she rejected you so she could think about it some more? I was once asked out by a girl and i instinctively said no, but i liked her and beat myself up for not thinking, maybe the same thing happened to her??? Or maybe your friend is joking around so you'd ask her again
All goods, I should add though, girls like confidence... dont go up and be nervous, treat her like a friend and ask her casually and with confidence
Talk to her on the phone or do what kids your age do best: text message her 500 times a day.