I barley know her and she hangs out with several of my friends. She says bad things behind my back and when I asked her why she hates me she doesn't answer me. Should I just ignore her or what?
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Yes, ignore her. Or kill her with kindness.

Yes, ignore her. Or kill her with kindness.

Makes sense, I will just ignore her.

That's what my mother would tell you. "Ignore her, and she'll go away." There's no satisfaction in being ignored.