Need to rant

This girl(E) has been obsessed with my boyfriend since june!!! They started to snapchat in which I don’t mind then she started to make up that -my boyfriend sent nudes to her -Felt her ass -Would do stuff with her,she told all this to my good friends,they even wrote it down and when I asked my boy he texted her asking if she said this and she(e) denied it,he ended up trying to put her in her place and telling her to leave him alone!I recently asked one of her good friends if this happened and she said that she(E) is obsessed and she doubts it happened.She would constantly post on her story about him and send him aimed streaks which he would constantly ignore.Yesterday me and the girl(E) where in class together(we arnt friends but I wouldn’t intentionally be nasty to her)I told one of her friends that me and my boyfriend will be going out where we all hang out as we haven’t been out in a while,she(E) asked how long we have been together and I told her.Then later on that day I was talking to another one of her friends and she told me that she said “omg [my boyfriends name] is coming out tomorrow”,and was talking about him.Her friend just laughed as she knows he wouldn’t bat an eye at her(her words) I told my boyfriend about this and he was weirded out I also asked what he would do if she tried to talk to him and he said he would tell her to get out of his face.I know this girl is crazy but what can I do in this situation as she never says any of this to me!!