You are quite correct. And I wouldn't be surprised at all if Grunwald was the source of the leak. What you said makes perfect sense. Mandy had a new baby (frightening thought) and Plame had 5-year old twins. It would be perfectly reasonable for Plame to have called Grunwald offering advice on nannies, pre-schools, pediatricians, etc. In fact, knowing the Plame/Wilson duo, it seems to me quite likely, given that they were all about moving in the Rat social circles.