Tree, you're in a tough spot. It just seems like she is putting in no effort what so ever and seems so hopeless. Exactly so. She is putting in no effort. So your decision - wait it out, or not?
I like your music analogy. That's so evocative.
Rather than leave the house, or stay and continue arguments... could you... stay and quit the arguments? If the arguments are what bothers the kids... maybe... stop them? Just cease. I know that is easy to say, hard to do, but it may be an option for you.
I think she should go find a very simple to take care of place so she can chase this dream. I see some wisdom in that. On the other hand, I politely suggested something like that to my W, and she reacted very negatively, as if I were trying to take the kids from her.
I think my W's "dream" is a little different from yours though. She wants me to vaporize, but she wants to keep all our income, and she wants to retain full custody of the kids. That's not a dream I can indulge.
anyway, Tree, this is hard. I don't know what to say to you. In times like these I found it was helpful for me to just be quiet. Be quiet and calm and wait a while. Then after a while, I would see the answer I was looking for.
M 43 S14 S13 D11 D7 Divorce final: Jan 2009 Making it up as I go....