She isn't interested yet she is always alleyes when I talk to other girls why?

So I'm interested in this girl she is two years older than me I must admit it isn't going to well she doesn't seem interested in me however I do observe some signals 1. She is always staring at me when I'm occupied) would turn away when I notice 2. She is always staring at me when I'm talking to other girls like dead at me and whoever girl which is weird why are you staring at us so hard (all of them are just aquintances the only person I'm interested in is her)

She isn't interested yet she is always alleyes when I talk to other girls why?
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