@jaxsn Good on your son. As others have said, make sure those photos are deleted from all devices and any cloud accounts as well.
Reach out to her parents and let them know to monitor her devices more and put on parental controls - she's not ready for unmonitored access to the Internet.
@goldensilver Came here to say this - if they're threatening harm to anyone else or themselves, immediate hospitalization is required. TAKE HER TO THE ER - DO NOT WAIT FOR THE REFERRAL APPOINTMENT.