Why she nitpicking at me in class while I mind my business?

I’m quiet girl and this other girl is kinda quiet n shy to but acts like she nice and stuff but she’s really shitty person. But she will make comments like “Nicole doesn’t have no friends “, “Nicole is the only one not going to prom” and always obsessed me and her friends can just never leave me alone.
Why she nitpicking at me in class while I mind my business?
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