Wow, that's a really unfortunate turn. Like Sunny, I completely understand your feelings for W right now.
I may be wrong---you certainly know her better than I do---but what I hear from her comments is huge fear. GD, she knows she's in a bad place. She's living with a guy in an R that isn't going anywhere; she's partying all the time; you've got your act together. Now that the D is becoming reality, she's afraid of what's going to happen to her. I totally get that.
You obviously have to protect yourself financially (and legally, re the DL thing). IF, and that's a humongous IF, you wanted to show your W some more impressive GD moves, you could do what Sunny suggested. When you've talked to W before when she was in a state, you were able to listen and validate, and she came around.
Where you stand right now probably makes that really hard, but if you could do the same thing and talk to her about what she's afraid of, I imagine that would be really powerful for her. She might not be able to hear it, but she might. And it might work out the best for everyone, you included. Just a thought.
GD, you've come so very far. I agree that your life is going to be great, regardless of whether you find a partner or not (but seriously, I have no doubt you will, if you want).
I know you don't have a lot of time before the hearing, but use it wisely. This is probably the ultimate moment in your R. Show your stuff.