Girl Is really stressing me out?

I have no idea what's going on with this girl she's really weird, so basically I've been noticing for quite a while now she looks at me a lot, which is fine I don't mind people looking at me. Over the shoulder looks, out the corner of her eye, looking at me when other people are talking to her, to the point where the people she's talking to will start to look over to see what she's looking at, you name it she's done It. And I've also noticed that her friends sometimes point me out to her to which she'll turn around and look. But when I seem to try to be friendly to her she outright ignores me even If I just say "hi" to her. And when she has to interact with me (because of the job she works in) she'll just stand there in silence and not say anything until I speak, but sometimes she's able to engage me like she does other people, but it always goes back to square one every time,

She's absolutely not like this to anybody else and can interact with everyone, but she can't with me and it's within the same setting, she'd be interacting with me the exact same way as she would with other people, I've always been very nice and respectful to her
Girl Is really stressing me out?
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