Just curious, but what is your enclosure like? Does she have some good burrowing substrate? Some thick aspen substrate worked really well for my girl.

Try feeding at night, with the lights off. It may help. Also, I know this is kind of gross, but since you have live rats and she eats them, try rubbing the f/t rat or mouse in some of the dirty bedding of the live rats or on one of the actual rats, though I would guess many would be against that, but it's more gross than anything.