She's not nervous around me anymore, is that good or bad?

For a while this girl seemed very nervous most of the time around me. It got really bad at one point. I was torn between thinking she didn't like me and that maybe she did. She'd want to chat sometimes online, despite acting awkward in person. Now though, she's not nearly as nervously, and is starting to tease me, and joke around a lot more. So what the hell? I'm not complaining, I just find it odd. Either she hated me and doesn't anymore, or she liked me and she lost interest, right?

Note: She is NOT my girlfriend. I don't even know if she likes me back.
She's not nervous around me anymore, is that good or bad?
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