your W is so wacked out there is no way sharing your private thoughts with her - even sanitized - can possibly result in anything good. If she is that desperate for communication, focus on positive, forward oriented conversation. Allowing her to dreg up the past will only fuel her fire.
There is nothing you can do about her comments about "the journal" just as there is nothing you can do about her comments D is the only answer. Control what you can control - which is yourself and your actions, and count on God to control the rest.
Although I understand its justification, I'm personally a little discouraged a solution to your sitch is for you to move out. Mainly because I'm struggling with a very similar issue. I do plan on moving this summer, but with my kids, and invite my W to move with us. I'd say in your case you need to keep your overall goal in mind, and not let the little things get in your way from taking the little actions necessary to reach your overall goal. I've had to change mine to be a little more vague to allow for possibly not having a W, but maintaining my vision for my family.
Of course a whole other tact is to use the journal to push her over the edge, and get her to move out, but then you are counting on her reaction, and that is always dangerous.