Why would she follow herself on instragam without my consent?

So I forgot my unlocked phone on the desk and this girl who is in my class never interacted with her before. Took my phone without my consent and followed herself on instagram. Then followed me back.

I'm pissed off because she invaded my privacy. But why would she do that?

And should i confront her in class?

Why would she follow herself on instragam without my consent?
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