Ex bsf

So, I have this nearly ex friend named Lily. yes, I am name dropping. She is 13, (I'm not! I am older.) And dating an 18 year old. I told her it wasn't okay, and she tried to hit me at lunch for it. Now, she complains about him being a dickhead constantly and I don't give her advice. She never took it before so I'm not giving her It anymore. Is that a dick move? She got me addicted to vaping and smoking weed, (i'm not addicted anymore) but it still hurt me. She sends me pictures of her boyfriends self harm and her own sh, asking what to do to hide it. Keep in mind the photos she sends are fresh and still bleeding, so I'm genuinely disgusted. It would be one thing if she asked for advice for SCARS, but open cuts is fucking crazy. I'm not blood sensitive, but its still something I don't want to see. Yesterday, she wanted to come over and she cried when I said no, and now wants me to come over and hang out with her and her boyfriend. I've told her no so many times and she's still pissed. At lunch again, me and my friends were taking and having fun and she screamed at us all, saying "You guys aren't fucking funny, I hate you all, I can't ever fucking sit in peace and just eat." Well, you can..But you're starting fights with people who already do not like you. She openly talks about her sex life (which is disgusting for a 13 year old. And an 18 year old.), lies to the group, calls my friend fat when he struggles with weight issues and body images, but when someone is rude to her she freaks the fuck out. Shes never at lunch anyway, she's always in the bathroom smoking and texting her boyfriend. (Keep in mind he's not even in high school anymore, he's gonna be 19 this year.) So she can't say shit about our lunch table. She also uses slurs she cannot reclaim, (Tslur,Fslur,nword) and then calls us racists because we were eating crackers, and not even doing anything. This isn't even all the stuff she's done. Lmk if I should finally drop her for good? I have no classes with her this year except for lunch. 

Thanks for reading this😓