Should I ask her why she decline my Instagram follow request or just ignore it and move on?

My crush of almost 2 years doesn't seem to feel the same way apparently, and I'm lost, I'm over her but when I see her, feelings come back :/ and they're out of control. I haven't told her I like her during this time because I'm almost certain it's a dead end. She barely notices I exist sometimes.

Anyway, I requested to follow her on Instagram a while ago and she kept it pending, up until one day I noticed she declined it. I haven't asked her why she did that because I don't want to seem desperate, all I did is I ignored her. I acted like she doesn't exist. But my question is should I ask her why she declined it? or is it a bad idea?
Updates
+1 y
She was active there when I made the request and when it was pending. So she was ignoring it but I don't know why she decided to decline it.
Should I ask her why she decline my Instagram follow request or just ignore it and move on?
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