A girl at work I've heard likes me and she acts like she likes me to, but she won't talk to me, why?

She'll always stare or I'll catch her looking at me but she doesn't smile or anything, I'm confused I know some girls are shy but this girl is really outgoing and talks to lots of guys and has some guy friends
A girl at work I've heard likes me and she acts like she likes me to, but she won't talk to me, why?
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