Communication breakdown?

Lastnight I was in a concert for a banquet..I use to flirt and talk to a friend of a friend who is in the band.That girl kind of stopped talking to me and never made effort to call me back or communicate..I couldnt tell if she was mad at me.I am a good guy and I dont play games I was very direct in showing her I liked her.Well lastnight I ran into her and we have mutual friends so we had to sit at the same table after my band performed...I wanted to say hi but she wasnt really looking my way.I did catch her 2 times staring at me when I wasnt looking.I acted normal joked around with friends and was friendly ..I couldnt tell if she was inviting me to talk or whether she wanted me to completely bug off ,so I stayed distance and didnt talk to her directly. Anyhow..she seems nervous,or uneasy I just dont know if Im doing the right thing.If she doesnt like me ,why would she look at me when Im not looking..and I cant tell if shes afraid to say hi to me or if she wants me to stay away.