Maybe she was a decent step mother, caring for the 2 steps/1 bio kids, and she pushed/hit him in the wrong way, he got hurt, and eventually died. Maybe she saw the possibility of the home going up in fire and really freaked out (or some other major trigger). That would be Occam's simplest solution. Didn't she say she helped AS get custody by going to court many times? (insert big story we can't talk about ie the "whys"). Two years is a long time without other children telling tales. JMO, but I don't think her actions in the case of Gannon have to be "supported" or "justified" or "predicted" by some long period of stepmom abuse. I think it will turn out not to be premeditated, at least over a period of time, (because there are too many loose ends) and the result of some over reaction she had in pushing or hitting him. (BTW I have a bunch of wicked stepmother tales of my own, it's not all black and white between step relatives and I see that only now that I am old).