Question

Can someone help me please start off my story by foreshadow please it will mean a lot to me. It has to start off with a foreshadow. plEAse GUYS!! My story is about Alexis(the main character) starts off her school day fine until the popular/mean girl starts begging her.after a while the popular/mean girl start damaging school property for example causing fire and writing on bathroom walls and when the principal asks the popular/mean girl who did that she blames it on Alexis that didn't actually didn't do that.