Is she considering dumping him for me?

The other night I was hanging with a buddy of mine and three other girls. One of them I really like, but she has had a boyfriend for about a year now. At dinner I mentioned him, and she seemed to almost speak of him in a bad way, like he was annoying her. When we went back to my house, her and I were on a couch by ourselves. She would constantly check me out when I would waltz back into the room and move her bare legs down the couch so I couldn't sit, teasing me. She then let me rest my head on her legs as it got late, and was even considering sleeping over until her friend's parents called for them to leave. She left saying she had a great time, with a big smile on her face and ran off giggling. This girl is beautiful and petite with dark hair and dark eyes. I'm confused as to whether she was considering me as an option if she breaks up with her boyfriend, or she is just a huge flirt that likes the attention. What do you think is the case?