if she's 1200 grams 7 large mice is a lot at one time. And if she hasn't eaten in a while. you don't want to slam her with a lot of rodents right away. get her use to being on feed again. I have a female that's about 3960 grams and she's a mouse feeder. She eats anywhere from 0 to 4 mice every 3 to 4 days. and sometimes when I offer she won't eat.