Ladies Help! What's she thinking?

Alright so I have the BIGGEST crush on this girl in one of my cles (I'm in college). After a couple weeks of admiring her from afar I finally mustered the courage to talk to her. I approached her after cl and said "hey I noticed we walk the same route, want some company?" She said "Sure!" We talked the whole way and I found out she loves to snowboard as much as I do (how cool is that??) I left that day feeling real good about my chances. I see her in ping the next day, we exchange hellos and smiles and I left it there because I dont wanna come on too strong. The next day we talked a good amount again and I walked her to her car again. Thing is, I have NO idea if she is interested or just being nice to me. I'm usually pretty good at reading girls but she seems pretty shy. Its not like I have to force her to talk to me but I'm definitley holding the convo you know? Ladies, what should my next step be? She has to know I'm interested (why else would I approach her?) but I dont wanna come on too strong or too soft and scare her away! When we got to her car I said "have a great weekend" and left it at that. I have cl with her again on Tuesday. Do I play it out a little longer or do I take a stab and ask for her number or dinner or something. Thanks for all the responses!