I believe you have made progress down your path. And, you take it very seriously when working on yourself. I like it.
I am curious about what your therapists say about the conversation with W when she was angry over you putting things on hold to give it thought. Is this something you have always done, or started doing after BD? Sorry, I can't remember, if you've said.
I am not saying it is right or wrong. I see you being "cautious" and taking every decision about daughters very seriously. And, I can see your W's frustrations with this.
I did notice something a second time. Her impatience when she was speaking to you and your attention was on your child. Just to clarify, did your D interrupt while W was speaking, or did W interrupt what you and D was doing? It really rubs her the wrong way, doesn't it?
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!