She could easily take 3+ mouse fuzzies in one feeding or at least 2 rat pinkies in one feeding. Honestly I would jump right up to at least mouse weanlings/small adults or rat fuzzies/small pups and bypass the pinks. If you're wanting to switch from mice to rats I would buy a rat fuzz/pup and see if she'll take that: that way you don't need to worry about buying more mice.