Why can't she be herself around me and what should I do?

Anonymous
This girl when I first met her, she seemed very different from how she's acting now (I liked her better then). She was flirty and teased me and knew how to snap back at me and would make me laugh.

But now she has a crush on me (I can tell she gets nervous around me). And so now she can't joke around with me, all she can do is have a shy/silly/goofy/nervous smile around me and laugh when I tease her and laugh at my jokes and let me touch her, but she won't talk to me about much except when answering questions. Probably because she's nervous? I don't know.

How do I get her back to how she was, and why is she suddenly acting this way? I mean I like her a lot too but that doesn't turn me into a timid quiet person or a nervous person, so why is she turning nervous now that she likes me?
Why can't she be herself around me and what should I do?
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