We had a former member here whose daughter attended RTC that might be helpful:
https://bpdfamily.com/message_board/index.php?topic=120563.msg1188708#msg1188708And there is this, too, with different threads about RTCs:
https://bpdfamily.com/message_board/index.php?topic=114267.msg12588412#msg12588412Blaise Aguirre's book BPD in adolescence has a chapter on RTCs if I remember correctly.
I don't know that anyone loves the idea of sending a child away. Even so, being on the receiving end of frequent criticism or obstinance can lead to feelings of guilt, low self-esteem, possibly depression, whether the source is a child or not. And being so beaten down is not a place of strength for supporting a BPD child. Kids with BPD are special needs and even working toward tiny little changes requires strength.
It's probably also useful to think of the teen years as a grieving period. So much emphasis is on launching them into adulthood and having a child who isn't even on the highway, much less the slow lane, can feel like debilitating failure. Your wife may need her own counseling to help her heal some of the wounds she has likely endured.