Help I am so confused by this girl?

I was talking to her early this week and things were going well and I complimented her and she got really nervous and started stuttering. Then later in class she came by my desk and was smiling and blushing and standing so close to me her hips were touching me.

Today I was thinking I would ask her for her number and I saw her and tried to talk to her and she ignored me and looked at the ground then talked to someone else. She sat behind me in class but didn't seem that enthusiastic when I talked to her so I decided not to make a move. At least she smiled back when I smiled at her.

I found her on Facebook. Should I add her and message her if she accepts?
Help I am so confused by this girl?
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