I think they did a Dateline episode about this whacko. Had the kids buried in the backyard, right? I won't wish violence on her, but that is very likely her fate, considering what she's done.
The justice is the imprisonment. People are not sentenced to be raped, tortured or murdered by other inmates, and the prison system should go through any and all pains necessary to prevent such things from occurring.
Ordinarily I would agree with you. But a parent killing their kids? Nah, fuck that. Your justice might be the imprisonment. I hope she catches more than few hot beat downs.