How to get to know this girl?

I know this is a stupid question but this crap is annoying lol

Anyways, she lives in my dorm and the only time I see her is when she is walking through the basement or chilling with her girl friends. And last time I asked a girl (one of her friends lmao) for her number casually (no flirting!) she stopped talking to me...

Sooooo, I'm kinda hesitant with girls now lol This one is real nice but nowadays that means nothing.
How to get to know this girl?
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