this girl is trying to hurt me plz help me :(

ok so i met this girl at a bar, she works there she is the DJ. well she gave me and my roommate her number so we can be friends. so then the next day she came over to our place and she kept trying to get me to do coke with her and i kept saying no and she wouldn’t take no as an answer. and i don’t drink either so she kept trying so hard to get me to drink and i kept saying i don’t do that. it was very annoying. and then i said left my apartment to hang out with other friends and her and my roommate went to a bar. and the girl was mad that i didn’t go to the bar so she kept blowing up my phone and then she took my roommates phone and called my roommates mom telling her i’m on drugs and i’m not.

and then she was telling my roommate that she is trying to fight me and was telling my other friend that she is going to kick my ass next time she sees me. and she keeps trying to find me, but obviously i am avoiding her. and the thing is i don’t really know her so i’m not exactly sure why she hates me so much. and she is seriously she wants to fight me. and i’m soft i don’t fight or anything that’s just not who i am.

so i don’t know what to do bc she isn’t going to be leaving my life anytime soon bc she is about to date this guy who is my best friend. and then she is trying to be super close with my roommate. and she keeps talking smack about me to them and she is trying to get them to get me to see her so she can fight me.

should i tell the cops that she is doing coke? i know that she can go to jail for that. and she always has it on her so they would easily find it. she can’t go 20 minutes without doing coke. i could do it anonymously so no one would know it’s me. but i’m just scared

thoughts? idk what to do