Gh---been a long time since I posted. I can't diagnose if your W is clinically depressed, but is sounds like something is going on there....as with my H too. I think he always was a little, but really hit the peak with his MLC....perhaps the same with your W.
I know H needs to see someone, but I can't make it happen, no matter how hard I want it and see his life spiraling and at times mine with it. She knows that there is help out there with therapy/C/meds. She knows she needs to "do something." You support her and she knows that.
In my experience with 2 friends who suffered from clinical depression, each of them went through TWO years of being depressed and supported and knowing they had depression and knowing they needed to do something about it. It hurt to watch them spiral, to watch them suffer, and I turned blue in the face telling them to see a therapist. They finally did. WHY? B/c they finally had the desire in themselves to do it, for THEM. That desire has to come from within, to love yourself, to take care of yourself, your life, your family. Therapy takes committment and lot of work, and that work can only be done when you open yourself in those ways first.
Be patient, she will come around. Seems she already is. It's hard to watch someone go through this, but I am a big fan of people doing things on their own.