GIRLS, I'm CLUELESS: Caught eye across the room and she winks at me, among other things, what does that mean?

[Marshall]

Busted this girl checking me out like 20 times during a meeting at University... she would either look away or we would stare... later that night, she found an excuse to message me on Facebook for the first time. We had talked previously, but since then she seems awkward around me. Tonight was another event that we were both at... my friend caught her looking at me 5-7 times in two minutes, constantly glancing at me. I looked over at her across the room and caught her looking and she winked at me and smiled and gestured for me to come over and dance with her (it's a group dance though)... she did that a couple of times. When we do talk in person, it always kind of feels "awkward" , sometimes feels like she's "ignoring" me. This girl is not a "flirt" or type to lead guys on - she is very modest and grounded.

What do you think? Is there any way she is NOT doing this out of interest?