Even if she wants to do "DBT by the book" so that she isn't treating you as though you're fragile, I still don't see the need for her to add more to your plate by talking about being done on top of it. That's like being blindsided twice, especially since you guys just spent so much time rebuilding your relationship. She could have focused on the DBT issue first so as not to overwhelm you, and then when you begin to work on the deeper trauma issues you would have had a better idea of a time frame.