Going from live mice to f/t rats is a bit of a jump for most BPs, in my opinion. You may have to try live rat pups first since she was previously on live. If she takes a few live rat pups, try a prekilled rat (not f/t). My Pin was on live small rats for nearly three years and has been readily accepting prekilled small rats for the past few feedings. Eventually I will try f/t with him.