All dickery aside, Crossy, just go up and ask her. Back when I was awkward and such, I lost count of how many girls I let slip through the cracks due to being scared of looking like a loser. If she says yes to a date, that's awesome. If she says no, that's the end of it. It's important not to dwell on her though; despite how movies idealize it, admiring someone from afar over a long period of time is not very emotionally healthy.