Seriously, the woman was LEGALLY insane, pretty much everyone but 12 jurors, one lying prosecutorial "mental health" expert and whomever else believes she was guilty (heh)said otherwise.
Five mental health experts for the defense testified that she did not know right from wrong or that she thought what she did was right.
Dietz, a nationally known authority who took part in the Jeffrey Dahmer and Unabomber cases, was the lone mental health expert to testify for the prosecution, and the only one to say she knew right from wrong. Ultimately, the jury rejected her claim of insanity.
Of course, the whole case is just sad all around. :(