Mary Beth - I live in the Atlanta area, so this family is welcomed to contact me (julieb@attachtrauma.org). There aren't any trauma-focused residential programs in the area that I'm aware of (there is one that uses DBT effectively). But I do know of other young adult/older teen programs that might be a fit as well as people who could help them find the right program.
Chris 180 is a good suggestion if they are looking for trauma-informed counseling/therapy locally.