She's mental yes, but not to the point of not knowing right from wrong; an important hinge when considering legal insanity I believe. Its not the Dr, its not the husband, its her fault. She killed those children, she planned to kill those children and she knew what she was doing. All the rest is just hindsight of others wishing they could have stopped it, as occurs in any tragedy.
Well said.
Its amazing how many people want to find an excuse for her behavior.
Just think what they would be saying if she was eating a twinkie while drowning her kids?