"Had Little Kendra actually killed that intruder I guarantee you she wouldn't be quite so calm and sanguine about it."
Why? She did nothing wrong. Are you confused about the Commandment? For some clarity, the true translation is; Thou Shalt Not Murder. Justiified killing is allowed in self defense.
BTW; How Effed up would she have been if the intruder raped her for an hour?