If you're thirteen I doubt they'll really believe her, especially if your autistic. Don't drop it though, even being accused of a sexual crime brands you a pervert, so fight this. Bring it to the attention of the police and she will undoubtedly cave, Trust me on that. I've been interviewed by police before, and while my newfound nihilism would shield me now, there's no way any 13 year old could handle the pressure. In fact the interview I had with the police, for a minor vandalism charge (peer pressure), sent me spiralling into my current depression, because for the first time in my life I thought I was a bad person. Anyway, I'd clear this up or have rumours hanging over your head forever. I know it's scary, but that the situation your in. At the least, tell her you intend to bring it to the police unless she stops the crap. And remember, you can't be found guilty of something you didn't do
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The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists - Erwin Schrodinger
Member of the WP Strident Atheists