text: You mean she's spreading a rumor about you? I would first contact the dean of students, let them know that this girl is doing this, and she even admitted it to you. This is a bully tactic and would land her in mediation. That's what they did in my school when they were cracking down on school violence.  Mediation is a session where you, a counselor and the bully engage in 'peace talks' to get to the root of the problem. Most people who went to mediation came out best of friends. If your school doesn't do this, maybe you can emplore your school's dean for such a program because this is really distracting you from your education.