If you want to defend her do it, but not by trying to divert the conversation.
The cat she killed appears to be a healthy pet, called Tiger.
Here is the video of your feral cat.
https://www.youtube.com/watch?v=bhPiqSYgPuE
The vet, who was fired, appears to be a nutcase.
Wow, its not always easy to tell the condition of a cat as it sneaks through the brush on its way to go kill something. Many times its birds they kill. To the point where they will destroy the bird population in areas where the cats are out of control.