your just trying to justify your hypothetical actions like a self righteous (im going out on a limb here) christian.
it doesnt matter if there is a sane reason or not, the fact remains that if you or anyone else were to do this to her then you would be no better than her because you would still be doing what she did.
The whole point in Punishment, such as Beheadings in the Middle East, Death Row etc. isnt to justify the crime! Its to show the other fuckers who are tempted to perform a crazy act like that what will happen to them, thus keeping criminals thinking before they act. If, for arguments sake, they brought in a Law where you suffer the same faith as your victim and you microwave a kid and so must be microwaved, then its your own fault! You know if you do a certain crime what will happen so why do it?..unless your strung out or some shit and unable to control your actions