You did not specify exactly how long she has been off feed? A few weeks?
She may take a month or so off feed at times. That is not an issue at all. I have a few adult females that are binge eaters. They will not eat for a month or two, then they will eat 5-6 rats in the span of a week or two. Wait till you have a few that refuse for 6+ months.....
Try the hide.... it works. Any reason we are still using mice? Putting on weight is much easier feeding rats..... fewer meals and less stress introducing the prey less frequently.