Hi AC, I'm sorry to hear your W is still not doing well. If she still doesn't want to communicate much, I don't know if you've got much choice but to keep your distance. Sounds like she's processing stuff to me. Interesting that she still comes in to say hello every morning. When she does that, what all do you and she talk about? Is it just a 'hello' and she leaves? Or is there conversation?
Hey. What about that letter you're writing? How do you think it might feel to leave it for her to find a little early? That might give her some time to think on it and respond before you leave. [I'm amazed you have had the patience to wait this long! I could barely sit on mine for a whole morning before I gave it to my H. But that's me... dreadfully short on patience!] Maybe if you gave it to her early, it would help ease your anxiety about not being there for her, but at the same time keep you at arms length to minimize the chance of you getting pulled into more tumbling.
I cannot complain for not receiving from others, that which I've never asked them for.