I'm glad your mom has a positive attitude. I think that is so important for her...or my dad...or for any of us. Duh! So here I am whining and being negative.
It is hard to believe that our M's do dissolve so readily. Sometimes I still think..."I can't believe this is my life...it wasn't supposed to be this way" but you do go on. I think you are in a good and peaceful place, LG. That will help you. AND even though it looks to be almost over, I don't think anything is hopeless. Sometimes a D prompts the leaver to evaluate things once they are "free" and they find it isn't what they wanted. Never say never. Like you said you are in a win-win situation.