Your story is quite emotional and your feelings are correct.
She did not view this dog as family, or if she did, she accepted that the animal members of her “family” can meet this fate if they exhibit a dangerous temperament.
Every dog is not your loveable dog.
I recall as a kid we often had litters of kittens in the house. Most were great and I remember them all fondly.
Ocassionaly one was just crazy, constantly hyper and biting and scratching.
I feel sorry for the kitten and I truly don’t remember what happened with it. But if we brought it to a shelter for sure they euthanized it.
At that point you recognize a different dividing line when dealing with animal life versus human life.
We don’t bring humans to vets to be injected or gassed in the same situations in which an animal will be killed.
Maybe she was rash or stupid, but she wasn’t evil.
I agree, she isn’t evil. She handled the situation in the wrong way.
I understand about your kittens because we have a Maine Coon. He always dominated our dogs:)