Oh, okay.

Well I'd say don't play any games, just ask her out. If she refuses, continue to associate with her as before, as if nothing happened. Women have a lot of respect for men who have made advances and DID NOT lose their self-esteem after being rejected, but remained friendly.
You can't know for sure from her reactions how she feels about you. You may only piss her off and lose her. You're not the only guy in the world. If she is cute, she has many of them standing in the line.