A girl declined my follow request but then asked to follow me?

I'm confused on this one, there's this girl that i used to know in middle school and she didn't particularly like me back then, but anyways i saw her on instagram and i haven't seen her in like 2 years but asked to follow her. Later i get a request from her to follow me but then see that she wouldn't let me follow her? Usually i would take that as a sign she doesn't like me but then why would she ask to follow me?
A girl declined my follow request but then asked to follow me?
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