I could be wrong but,
It sounds to me like she likes you, but has become kinda shy because of that. It happens to me all the time. XD
I say don't worry about it, you've done nothing wrong, if you kinda like her you should keep making an effort to hang out together, make an effort to keep talking with her alot, and see how it goes. But yeah the fact that she seems to be talking less but still making an effort to be with you, that suggest to me that she likes you and is being a bit shy.
