school life

When my bestie and I moved schools, we made a new friend named Rina (fake name). Less than a month in, she suddenly turned on us for no reason. After she moved tables, she started giving us dirty looks, stepping on my bestie's shoes, and trying to turn people against us but actually it didn't work. During a merged class, Rina sat next to me at my bestie's desk and secretly scribbled "toxic" across a page in my bestie's notebook. Even though I apologized twice to fix things, she ignored it and kept targeting us. I want to report her for the vandalism and bullying, but I’m scared because she’s popular and shares mutual friends with us. I don't want her friends to turn on me, and I don't know what to do. I don't want my school life to be ruined just because of her. I really need an advice for it. *all name used in the story is a pseudonym.