Why did this girl unfollow and remove me as a follower on Instagram?

This girl works at the same place as me. Although, we have never properly communicated there in all my 9 months employed at the company. I once randomally decided to follow her on IG and then a couple of months later she unfollowed me and removed me as her follower. I was slightly confused about that as I have never done or said anything wrong to her and I don’t post that much on Instagram. One day I posted a story of me some friends at a bar and that for some reason caused her to do what she did.

dunno why she had to make things awkward at work now :(
Why did this girl unfollow and remove me as a follower on Instagram?
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