Why would this confident girl always avoid eye contact with me?

Namyar
There is one cute girl and i caught her several times looking at me, but it was always when i randomly look around and see her from far looking at me. When im closer she never does that as she probably does her best to look at me only when the chance of being caught is very low. When i catch her looking she smoothly looks away to the side never tries to hold contact with me for atlest 1 second. It could make sense to me, because i would look away aswell if someone would catch me so i dont look creepy, BUT... if i would catch someone looking at me i naturaly would look at that person for at least few seconds like ,, What you want?" But when i try to look at her and she look at me noticing i look at her, she still immiedatly look away avoiding that eye contact, like why? I've heard that some shy girls may do that, but from what i know this girl is heavily extroverted and confident, talking with anyone, i think she even knows im little shy.. so whats her problem? Is she's not interested than why do i always catch her looking? Is there a possibility that girls might do that just because they like to constantly observe the people without being attracted?
Why would this confident girl always avoid eye contact with me?
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