Yea I have noticed something different. Last year and early this year she would say hi often and give me a pat on the back an say whats up. Lately she says hi but its a little more suttle, not a big pat on the back. Im not sure if shes acting different because maybe she feels awkward around me or she just all of a sudden doesnt care enough to make a big deal. I would ask her out, its just that normally, at least from my experience the girl will tell one of her friends and her friend will tell me she likes me, and then I can go from there, thats whats throwing me off.