Do yourself a favor and break her of the mice habbit. You can get them off mice. Sometimes it takes alittle time but rats are alot better for them for growth and developement. If you still want to feed mice then feed whatever the animal will take at one feeding. Its not good to be feeding day after day. Also when feeding like that it screws up their digestive system. Its better to fill them up on one feeding, let them process and digest that and then get them on a bi weekly feeding schedule if your feeding multiple meals. If you do switch to rats then you can feed one appropriate rat weekly or bi weekly