What can happen if you smoke weed on campus?

Ok I have an enemy and all over her twitter while at school (gwynedd mercy college) she tweeted that she was smoking weed. I have physical proof of this..say I wanted to inform the school, would she get kicked out, lose her scholarship, or what..i know you think this its evil but she slandered my name in the worse was possible..i don't need the"don't do it, or that's mean and cold hearted" because I know and I'll take full responsibly of my actions..but what could possibly happen if I go through with this.