She stopped the attack. That's what it is all about. The fact that she does not have to live with having taken a human life is the bonus.
We should all hope for such a great result. She successfully defended herself and kids.
As a dental tech in the USAF I saw the result of a 12 gauge in the mouth....suicide attempt. Yup attempt...the woman lived. The docs and security police surmised that she bent over to pull the trigger thus pointing the barrel out the side of her face. Made a hell of a mess, birdshot in both the Maxilla and the Mandible and a big hole in her cheek.
As I have seen again and again here, and experienced in person. Shot placement is the key.
Freedom is not free