There have been inconsistencies in some of what Nancy told to her various friends, I agree. This is just another of those common sense or gut feeling things the jury will have to go with. It does fly in the face of what Nancy told her family and friends that she wasn't afraid of Brad.
I don't question any of the witnesses' truthfulness - I think they are relaying what they were told. But enough already, it's basically the same story. Let's move on already. We are not learning anything NEW at all.