Well, i will go against the popular opinion, and support her for defending ain.
It's precisely because of this education that he became a villain later, and still die even while he was ""perfect"", so what's the point to let him suffer agin for years when you know the end result ?
If she do nothing, an will stay the same as in the novel, hate everyone, and die after having a miserable life, alone since birth.
And of course, she would probably die too if Ain become even more of a psycho.