Does She like me?

I really like this girl right, and she started talking to me just before christmas 07' and has recently split up with her boyfreind (december 07'). She has also already rejected two other guys since then! I talk to her a lot on msn but I only really talk to her at school when i bump into her in the corridors, but i'm quite shy and never really get a proper conversation going - but I always smile at her and she smiles back. Iv'e been bowling with her and her friend once as well. I would love to be able to ask her out and be with her, but do you guys feel it is to early after she has broken up with her previous partner, or whether she likes me at all! Cheers.