sounds like she has a chump bf and looks at you cause she wants validation/attention, she probably does find you attractive but dont be surprised if she always seems distant when you try to talk to her or if you ask her out and she tells you she is already taken
im surrounded by women at work and the ones who stare hardest or show ridiculously strong IOIs right away are almost always married or in long term relationships and always start acting disinterested once i have reciprocated or shown interest back, but thats just my experience
This kind of sounds familiar.
I went out with a chick from my gym a while back. How I figured out she was into me was by the way she would
not look at me. Sounds strange but she'd go out of her way to not look in my direction but to look the other way even when it was perfectly natural to be looking my way - I'd be walking by her and she'd turn her head and look down a hallway with nothing there. Girls that are indifferent wouldn't care either way, might even just give you a friendly hello, but this chick was playing coy, until one day I saw an in and started a conversation with her, BOOM, and that was all she wrote....until I screwed it up later by striking while the Iron was hot (but that's another story).
Your chick obviously has some kind of interest in you, but whatever it is, her approach
is somewhat strange.