Does she like me...? (girls, feel free to answer too lol)

Hey guys. This forum is really cool, and I thought I would ask this here...


A little bit of context:
She invited me to her house on christmas, she said I could come over if I wanted. So I did. And when I get there, it's just her family... and then, me.... lol
Second: I take her out for lunch, and then she tells me to get to her house early in the morning, so I could have breakfast at her house. Then she tells me what they're gonna cook there, and asks me if I like it or not. At this point, I started to suspect something.

Then we go out for lunch, and she wants to stay with me after that, for a while. We went to the mall and talked, and she laughed at my jokes (she doesn't laugh a lot), and we had the greatest time.

After a few days, she stops talkin to me. Just like that. She doesn't want to talk to me (I can tell cause she behaves so differently), and I stop phoning her.

We didn't have a long conversation for about a month. Then she goes to the states, and when she gets back, she texts me, and says hi to me, and she told me she had bought me an aerosmith guitar pic (I play guitar). And she even tells me not to tell anyone cause she didn't buy anything for anyone else. And she was also worried that if I was gonna like it or not.

(sorry for writing this much lol). What's happening here?!?!? Does anyone have any ideas!??!

Thanks in advance!!

just to point out: she turns 16 next month. So, she's 15 at the moment lol.