Dear DD, You are doing everything right- by the book. Keep doing it. It sounds as if she is reaching out to you sometimes and you are responding well. As far as your question about how to act regarding divorce proceedings, you just have to continue on your DB path in the hopes that she will get cold feet about the divore before its too late. If you address your marital issues now,I do think it will backfire. I understand how hard this must be, but for now, it's the safest thing to do.
In regards to her anger when you are vague- this could be good or bad. If she is annoyed, but is very interested in your whereabouts, this might be good. If she is annoyed at your vagueness and pulls away, it's bad. So you have to decide which it is. Anger in and of itself isn't necessarily bad. Also, her anger may be the result of the the manner in which you are vague, not just the fact that you are vague. So think about it. Is there something about the way you respond when she asks you questions that irritates her?