I agree that saying you didn't fight enough for her can be a way of trying to justify her actions.

W knows where you stand regarding saving the M, correct?

Just stay your course and be consistent.

I don't believe it is that easy for someone to end a long term M. There is always a bit of ambivalence. The more time you can get here, the better chance of a turnaround.

There's always hope. Bust On!

M: A really long time.
Crisis: 5 years.
She's still worth it.

Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl