This girl says hi to me and sometimes I think she tries to avoid me? Why?

Anonymous
There is a girl who hardly ever tries to talk with anybody who isn’t her friend in my school. Even though this girl hardly ever says hi to anybody who isn’t a friend, she talks a lot with her friends. This tendency of never talking to people who aren’t friends goes especially for guys (she has only 1 guy friend while all the others are girls). I’m not her friend but for about a month now, she has been saying hi to me (obviously this is surprising to me). The only times she says hi though is before our music class in this room where we have to pick up our violins (I’m not joking, it’s only in this room she says hi) and none of our friends can be near us (usually both of our friends aren’t near us but if they are, she’ll never say hi). When she says hi to me and knowing the sort of girl she is (I’ve known her for 3 years), I feel very flattered but there are times I feel she tries to avoid me. For example, sometimes she just doesn’t say hi and just comes inside the room, picks up her instrument and just leaves. Another example is that she NEVER looks at me when we pass each other in the hallway. The last thing that makes me feel she’s avoiding me is that sometimes when we get out of our classes, I think she sees which direction of the hallway I’m walking in and walks the opposite direction. Something like that happened today: I was behind her and we got out of class and she started to walk in one direction of the hallway. I went in the same direction and got ahead of her (I was also trying to start a talk with her during this time). Almost instantaneously, she turned around and went the other direction and met up with some of her friends. Does she hate me? Then why say hi to me? Also please tell me if she is trying to avoid me? (By the way, there are 3 guys that I know she says hi to. She says it to her guy friend. She has told it to me many times. There is also a friend of mine who she said hi to but only 1-2 times)
This girl says hi to me and sometimes I think she tries to avoid me? Why?
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