I'm REALLY confused!girl trouble!?

A friend of mine has been acting wierd these past couple of months.She is neva the one 2 say hello first so if i dont say hi she doesn't say anything but she always says hi 2 every1 else.She insults me a lot,more than what she does 2 others.When a group of us r JOKING around with her she doesnt mind if other guys say sumthin mean but stares at me when i say sumthin like i've said sumthin wrong.When friends say stuff about me and her she denies it.2day we were walking 2 cl with her best friend and sum of our friends called out stuff about me and her and then she laughed a bit but started walking a metre behind me.She doesn't go out of her way 2 talk 2 me or be around me (sumtimes she doesnt pay attention 2 me).plz don't tell me 2 ask wots wrong with her i just want ur opinions on what may be up with her.i like her more than a friend though i haven't told any1.So whats up with her?