I do understand that you want the best for your W and I suspect you would agree (even through the anger, which is likely from frustration) that you want the best for her, even if the M isn't saved.
That said, your "thought" (and I understand that was just an idle though) regarding what she was so afraid of, with regard to therapy... well... only SHE knows that. And if she IS (more) afraid of therapy than she is hopeful for a great, positive result to the therapy, then she will continue to resist it.
Also, again try to understand, she may very well believe that she... really does not have a problem that requires therapy... that she may believe she doesn't have a problem, at all... personally.
Regardless of what you, or the mediator / therapist thinks.
Truth is, we ALL have issues that could likely benefit from working with a therapist or coach. Just that it will always be a choice. Working with a therapist (and possibly equally so, without therapy) may... or may not... result in positive growth.
You do probably feel justified that the therapist agrees with you.
That still doesn't make you... or the therapist... "right"... or her "wrong".
This question is rhetorical:
Do you want the best for your W?
Then let her follow her path and find her place in life and possibly back to the M. Only she can do that and she NEEDS to do that and will learn from her mistakes and her successes, as life tends to do for us.
In the mean time, it remains... how are you... working on you...? That age old question. And I KNOW that you have posted above regarding some of your GAL.
I would ask... WHAT ELSE? What OTHER GAL and 180s are you doing, that you haven't already posted?