Honestly, I'd just try to get over her and move on.
She was harsh to throw away your number like that. I don't know if she was in a bad mood or if she was trying to send you a message. It was disrespectful though. Assuming you've been pleasant and not creepy, you deserve a bit of respect at least.
It's a crappy feeling, I'm going through it myself. You will get over it though. At least you've tried to get her attention. Lots of people are too shy to do that. Think of it as getting one step closer to finding someone.