I guess I come at a slightly different viewpoint not having children but I think it makes more sense to send her to a mental asylum than a prison. She was obviously insane if she believed God spoke to her to tell her to kill her children, and the manner in which she killed them. I do not believe that there is any point in executing her as with the correct treatment she may come to her senses and realise the consequences of her actions and repent them.
If she does so then perhaps one day she will be safe to participate within society again, if she stays insane then she stays locked up in the asylum.

As for the husband not hearing the screams......how many of you have heard screams while children are playing in their nearby back gardens or the street. If a child screamed repeatedly then most of us would go to investigate, but once or twice? I do not think many people would think it was more than kids playing silly buggers.

Oh well thats my six penneth

Oh, and in the UK we have several prisons which are secure mental facilites for those who have been convicted on insanity pleas or confined for the safety of the general public.