A veterinarian should be able to tell the difference between Tiger the kitty, and a wild, feral cat, or as you describe them “They are diseased nasty creatures.”, especially when she is walking up to it close enough to shoot it in the head with her bow and arrow, to get her first kill and at her home.
She wasn’t on Safari, in Borneo.
So 20-30 yds is close enough?
If she was at her home then the cat was on her property. Its not her job to police other peoples pets.
Bingo! Piss-poor vet.