Suicidual Autistic Teen

This is gonna sound dark, but is it my job to keep this teen alive? We have counselling, we have services, we have time together, but everything I do seems to come back to cycles of "I want to kill myself because I'm not like everyone else," from my teen. I'm tired, I'm broken, and I don't know what to do anymore. They refuse to take meds, and have already done a spell in a mental health facility which only made it worse. What am I supposed to do here?