She is the one who continued to drive her car after her baby died in it because it was a perfectly fine car or something like that.
I do believe that Lynn Balfour left her son (who coincidentally had the same name as my youngest son) in the car by accident - however, her stoic reaction to it all and her desire to keep driving that car seem strange, to say the least. I chalked it up to military discipline (she worked for the JAG's school). She seems to be a very practical person, maybe to a fault. I was glad to read in a recent article that she has quit her stressful job and become self-employed as a cleaner, which allows her more flexibility with her schedule and time for her 5(!) remaining kids.