Just catching up with your life. I am so sorry about the papers and your W's irrational behavior. Your daughters seem to be truly wise and secure in their relationship with you. This is a great foundation for dealing with the crazy. It isn't about you being a perfect parent but you are truly a "present" parent and that is priceless. Your willingness to be emotionally and physically present speaks volumes about your character and your love for your family.
As for a parent saying "they are done" I can tell you that is exactly what happened to my H. It will two years in June since he moved to another state and my girls haven't heard his voice in a year. H said their relationship was up to them yet he has yet to try to empathize or reach out. It is as if the man who coached their basketball team and went to every recital has disappeared. The only solace for me is some weird validation that if it were our marriage H would still be a father. The fact that he discarded all of us so completely is proof something is very broken inside of him.
Even though your W is not well you can't fix her. Sometimes the best thing you can do is honor your love for her by honoring your daughter's... Continue to care for them in the way your wife would have wanted before she lost herself. Try to focus on that and you will show your daughters what love really looks like.
Be good to yourself Irish. Hang in there.
M:25 years at BD w/ 2 daughters BD: 5/14 Separated 6/14 - H moved cross country w/OW D Final 9/17
“I can be changed by what happens to me. But I refuse to be reduced by it.” ― Maya Angelou