Im confused on how she is acting?

hi so this one girl is giveing me a ton of diffrent signals for instance she will put her head down and angle herself towards me and when i try to talk with her she says as little as possible and then leaves however when she is with freinds and im in the same room she laughs all class long. I have been giveing her drawings and notes recently and she shows her freinds but never really gives me any other indication she is intrested or likes them and when i say hi to her sometimes she will not bother saying hi back specifically if her boy best freind is around but if she walks past and i say hi she will sometimes say hi back. this is really hard for me cause i like her and feel sad when i dont see her but her behavior is all over the map for me and drives me insane another thing is i can't seem to talk to her an any scenario with or without freinds. for instance yesterday i picked something up for a freind of hers and he just said oh god and then i picked something up for another freind of hers and she said to her freind dont be lazy im really really confused...

Im confused on how she is acting?
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