She is that stupid yet she pulled off this crime?
I haven't followed it closely, but she apparently met her husband at a shopping center to show him "their" child ... and he believed her? She was also showing the child off to family and friends. To me, that suggests she's legitimately crazy or dumb as a rock. I may be missing some crucial information, but I'm guessing there's a serious lack of education here, and often that can be used to show low IQ - whether it's low or not. Anti-death penalty lawyers use the argument all the time, and I've seen it work many times. Just last year I sat in on a trial where a guy shot and killed an old man during a hold-up. His IQ tests showed he was outside of the "borderline" area, but the defense put it up and the jury took it anyway. It was a heinous murder (most of them are), but he got life w/o parole because the jury decided he was stupid.