Does she like me? girls help?

So this girl has told me that I am a cute guy. She repeatedly laughs at my jokes although they are not funny. She always says 'hi' to me everyday at school. She said happy birthday to me like 4 times at school. She sent me a happy birthday message at 12;00 am with hearts. She then sent me another happy b day message later on that day. She asked me if i wanted a hug. A friend has told me i should ask her to homecoming, but the problem is that she has a boyfriend. Why would she send me hearts on facebook? She said i was her "favorite mexican". She is asian by the way.