I wonder if the subject just wore her down. A friend of my late parents was one of those soldiers in the Bataan Death March. He survived and came home to raise a family, but was haunted until his death by the experience.
I thought the same thing. My step-brother's grandfather was the ranking officer at Bataan and extra-special treatment was reserved for him.
In addition, my father spent a great deal of time in there in WWII as an OSS agent. Never got a lot of stories out of him, but the ones that I managed to wrest out of him explained why he slept with a gun under his bed until the day he died.
Quite possibly, I am a death historian (Thanatologist) and there are times when you need to take a break from the subject, which is hard when you are trying to get a book done.
You friend suffered first hand on the Bataan Death march. She suffered second hand and not physically via starvation and Jap cruelty. Nor the way the people of Nanking did.