Why Would Someone I Follow, Follow Me, then Unfollow?

So this girl, on Instagram, used to follow me. The after a long time, she unfollowed me, so I unfollowed her. But then as an experiment, I requested to follow her twice and she denied me twice. I don't want to follow her, but why would she do something like that? And she follows my sister, and my sister and I have about 95% of the same content! I mean I started to gain more followers than her and I have over 58 more followers than her. She lost about 20. So why did she unfollow me?
Updates:
0Girl Opinion
1Guy Opinion
Related Questions
What Girls & Guys Said
00The only opinion from guys was selected the Most Helpful Opinion, but you can still contribute by sharing an opinion!
Related myTakes
Click "Show More" for your mentions
Most Helpful Opinion(mho) Rate.
Learn more
Learn more
AI Bot Choice
Superb Opinion