What kind of therapy did your wife get? In what ways wasn't it targeted, was it perhaps aimed at other issues but ended up also helping with her BPD issues?
she was breaking down due too much pressure. I was seriously sick and she supported me, then overtime, new boss and some work related conflicts that overwhelmed her. Not that she contributed much at all but her coping capability was exhausted and she took a longer break to recover. It is not clear to me what exact approach her T is using but clearly she is working on boundaries at work and mother related issues (also a lot boundary setting). As one can see often here when she started therapy the relationship with me was also questioned. I was sort of expecting that

and I was able to coast through that initial phase without real escalations. Since getting on this board I focused a lot on validating her and as far as I can tell it rubbed off over the years and improved her ability to self-validate. Helping her on the boundary side I found more difficult (our short term interest are then misaligned) although we got together some fair improvement wrt. the worst behavior from her mother. Therapy has helped her here and with better boundaries she is less exposed, has less to cope with and functions better.