You might need to do the zombie rat dance next time, especially if she was fed live. You can hold the rat by the tail or use tongs to pick it up by the hindquarters or the scruff of the neck and move it around to make it look alive. It might also have not been warm enough for her. Wait a week and try again. If she is a decent size a week won't make a difference. Also, since she's an adult female, she might be off feed for the breeding season, so don't worry too much if she keeps refusing.