So I'm an 15 m and the girl in question is 11 and I just met her?

what does it mean if a girl that i just met punches me and pinches me if i didn't do anything to deserve it. she also sat down next to me then did it. She is nice to all the other kids/teens but me so what is going on? and this all happened in under 25 min

So I'm an 15 m and the girl in question is 11 and I just met her?
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