Have you tried Day Treatment? I doubt they'd keep her in a boot camp. She isn't bad...if she hears voices, she is mentally ill, and boot camp isn't going to change that, plus they don't really like to deal with kids who have mental health issues.
I think your best bets are Day Treatment or long term Residential Treatment Center (RTC) mental health placement. If she is hearing voices, she really needs a medication switch. Is she taking an antipsychotic? Certain medications can even CAUSE hallucinations. Can you please list her medications? That would help us help you.
Hugs...good luck.