Well, here is an update on my situation for those who care:
I cut her off. She threatened to cut her self, kill herself etc. if i cut her off. We shared "lewd" photos before i knew her real age. She threatened to disclose this information to the police if i "upset" her. My cousin helped me research the laws, and its fine that we shared the photos. Perfectly legal.
I was convinved that prison was an option for me. I panicked a little, and took it seriously. This girl was crazyyy, but obviously not educated on the law. I deleted my snapchat, and its over.
Im a little sad, but mainly sad for her. She needs serious help. Her life has been terrible. Very pretty girl, very cool besides her mental health. I was her first "boyfriend." I was surprised because she's literally a 10/10, but now i see why.
Thanks for all your advice, it was golden!
Edit: she was in love with me (or so she thought). She will definitely be depressed, but she crossed the line.