I would up the size to pups or weanlings. ... fuzzies are really small, one step above pinky. You need at least pups, lots of bps take pups from birth.
Guess i shouldn't have bought 50 fuzzies recently lol. She seems full after eating though. When i was feeding her smaller rats she would take two. Now she takes one fuzzy, they are about 15-20g, and goes back in her hide.