I can feel your pain in your writing brother and I have been there my friend. You're use to being able fix things in your life that aren't working. This is something that you can't fix and it's a bitter pill to swallow. Unfortunately once they make up their mind there is typically no going back until the divorce is final and they spend years understanding the damage that has been done. I have cautioned you in the past to temper your expectations. You will feel good about the fact that you fought for your family to the bitter end.
Its time to drop the rope and give her the freedom she is asking for. Time to open the cage door and let her run free. Sometimes life teaches us really hard lessons but that's how we grow.