Why would she do that? I'm confused?

There's a girl I'm friends with. We're just friends. I haven't shown any interest in her or anything and I'm not interested. We have each other's numbers we'll text now and then. I have her on Facebook and linkedin too. Her profile came up on instagram, probably because we have each other's numbers. I decided to follow her, figure it's okay, we are friends. It's private so it says requested. It's been a few days and it still shows requested. Didn't think much of it at first but then I noticed it seems she may have followed and been followed since I put in there request, so I think she ignored mine. Why would she do that? Like I said we're friends, we have each other's numbers and on other platforms and all.

Why would she do that? I'm confused?
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