I have a big girl with the same problem. Have tried it all but if they are f/t she doesn't pay them any attention..... I starved her for almost two months and still no take. I gave in just a couple days ago and gave her a live rat pup. She took it without a problem and then while feeding response was still high I tried a f/t rat pup and she acted like there was nothing there..... Will keep trying but don't see her ever giving in....

I hope you have better luck....