HDog... I am thinking you should respond to her with something simple, so as to avoid her ability to distract. How about asking here, " Why does sex feel like a chore to you, the equivalent of doing laundry? I'd like to understand."
BTW, I also find that written communication works best for me. I am down to the file card system, where we can talk face to face, but I keep a file card with me to stay on point.