Interesting Roist, my H complains any time we have a talk (which isn't often) that I never tell him anything. I've told him time and again that he is the one who left and if he wants to know anything he needs to ask me. He just gets by on less and less information and tries to get it from the kids, who are no longer playing along with him. Now he just makes wild assumptions that I hear about from time to time. I was an over-sharer in the marriage and always gave him the low-down without him having to ask. Sounds like your situation was the opposite.
In terms of the experiment and annotate, have you ever tried to be more open and forthcoming just to observe what her response is and whether it opens a quest for information in her? Probably won't, but what have you to lose?
