Should I just unfriend her at this point?

I added a cute girl on Facebook who was friends with my sister. And a few days later, I messaged her, and I was just trying to get to know her.
So, she saw but never replied to the message, and also hasn't unfriended me.
It's been a few weeks since, and she's not interacted or responded to me, but is still friends with me.
Why would she still have me as a friend? And should I just unfriend her at this point?
Yes
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No
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Should I just unfriend her at this point?
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