You've probably already tried this but how about taking some thing frozen and warming it up a little in the micro wave or in my case frying pan (no microwave), it would make it seem more like "prey" still being warm? I offered Nef some lambs heart and she stuck her nose up. I put it in a frying pan to heat it through and she gobbled it down purring. I don't call her fussy pussy for nothing. lol