Sorry to hear about your huntress.
Our Guinness probably will never be a hunter.
We do have a small population of foxes.
My experience is that only the quick and the smart survive outside.
We don’t want to lose our fat cat. We just want her outside.
My daughter-in-law decided their indoor cat, Louie, had to become an outside cat when she got pregnant. Louie had been declawed and didn’t even want to step on grass.
They started gradually and he started staying out all night, coming home exhausted. They said Louie seemed to become a teenager. Keep in mind they live in a large subdivision—really no predators.
In short, Louie has become the darling of the neighborhood because he digs up moles and lays them on the front porch of the homeowner. He also devised a way to fight with other cats in which he hold them with his back paws.
He still comes home for food sometimes and they let him hang out in the house, but he is mainly an outside cat.
Too many dangers outside. If you don’t want to lose your cats, keep them inside.