You need to offer a live small mouse, obviously if fed live pinky mice the animal was underfed.
Breeders start their hatchlings on hoppers and quickly move to small and than adult mice.
Right now offering the same type prey is what should be done, than once your animal is an established feeder (3 to 5 consecutive successful meal) you can attempt to switch to rat if this is what you want to do (live rats) than again once the animal eat live rats with consistency you can attempt to switch to F/T
Switching need to be done one step at the time but for now the priority is to get this BP to eat for you.