Sorry to say this but either bury them yourself, leave at the vet and allow them to dispose of kitt. It's horrible and it doesn't get any easier-but if say it's still born or it passes in the first few days-it's easier to harden and move on than if you've fought for a number of weeks for a kittys survival and it doesn't make it
And you do because you have to for sake of your girl and other cats-and if they can-you must