I don't think the prosecution claimed she was imitating the attacks, only that she used the insanity excuse because of that episode.
I defer to your greater knowledge.
But her insanity started a LONG time before the killings.
She'd been in and out of mental institutions for years, suicide attempts, etc.
I am not opposed to her spending the rest of her miserable life in a mental institution, just as long as someone can guarantee she'll never be pronounced "cured" and let out.
Metally culpable or not, she's clearly dangerous.