Teenage Drama and I need Advise

Okay so kind of long story so let me just get into it. So I had this friend “bff”. Then she tried to start drama between me and this other random girl that I’ve never seen in my life. And she would come to me tell me stuff the girl “said” and then she would go to the girl. Once I finally figured out what she was doing I went to the office because my mother told me to. And the girl didn’t talk to me and I didn’t talk to her. And everything was okay well then she got pictures off my Instagram and printed them and cut them up and she posted it on her Instagram story. Advise?? ☹️