The D comments/threats are a fad. She'll either file or tire of mentioning it once she realizes it's not getting her anything she wants. My money is on the latter.
Whether or not your M makes it through this trial is more in your hands than it is in hers. Stay the course Cali, you're doing great.
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