Salvation Army?
The Salvation Army is NOT the place for a minor who needs psychiatric care. I know this from first hand experience as I went through their "Rehab" and was then hired as the House Manager for 2 years. They do not provide medical care of any kind.
I would suggest you call a major hospital in a metropolitan area. Ask for inpatient Psychiatric care and the intake coordinator can then direct you to a facility that can deal with a minor.
There are places that specialize in dual diagnosis clients who are underage.
Good Luck