How can I get this girl to leave me alone and stop bothering me?

Ok, so here's the story. There was this girl from another school who wanted to fight me for no reason. All the kids at my school got mad at me since they all thought that I wanted to fight her, which was a false rumor. This girl, Flo, who was friends with the girl who wanted to fight me got all mad. Ever since that little incident she's been cussing at me and laughing at me every time when I walk by her. It's really annoying because we were never friends and all the people who were mad at me about that incident have moved on except her! So is there any way that I can get her off my back?