Hi Bewildered Spouse,
Let me join
Once Removed in welcoming you to the boards.
I'm sorry you're going through such struggles with your wife. Members here will understand how challenging these relationships can be. It sounds like you've got a strong support system in real life - that's great.
She would come sometimes very eager and happy and other times not go because she hated the therapist for "minimizing" her anger and concerns.
People with BPD often have exceptionally high validation needs, which the therapist might not have adjusted for. Hopefully, the new family therapist will be a better fit for your wife. Is she seeing an individual therapist now?