I think that she is going to want to die after she realizes what she did.
As it was, she already stabbed herself in the chest and slit her own throat.
And Andrea Yates really was insane. She had severe postpartum depression and psychosis. She also had it after the birth of her second-youngest child and she and her husband were advised by her psychiatrist not to have any more children, but they had their youngest child and she went psychotic again. She had been in the hospital and had been taking Haldol until shortly before she killed the children. Against the orders of her doctor, who told her husband not to leave her alone with the children at all, her husband decided to leave them alone with her for an hour twice a day so she wouldn't become too dependent on the help she had been getting.