Give your own life a quick thought, how many of your own decisions in life, without you here to defend them, could be judged harshly after the fact. I'm guessing plenty, same as me, same as everyone.
You could be right. Right now, I cannot agree based on what I know. She may be responsible, she may be as innocent as any of those kids. The details will eventually tell the tale, I hope. But some details may never be known.