What should I do with her?

Like a lot of stories, theres this girl.. My roommates sister to be exact. My roommate and myself are good friends I've know her for years but never really talked to her until this year and recently hooked up twice two separate weekends (sober) but just slept in my bed and made out. So I know there has to be something there, but anyways I told her I liked her while making out and she replied with "good" smiled deeply and kept making out. Not sure what to make of it now.

But my question, this happened sat into sun. Even though its only monday but it seems like things are dying down.. I did nothing wrong... made her laugh had a good time when she came up to visit.. I don't want to wait til thanksgiving to actually talk to her again but I also don't want to keep insisting on snapping her. I do not have her number I don't want to ask and seem desperate, we talk through twitter sometimes and snap a lot..

Sorry this is long but suggestions to what she might think and where to go about?