If the snake appears healthy I dont know if I would stress over this just yet. Is the snake keeping weight on? Is it always solid when she goes tot he bathroom?

As far as switching it over I would try the scenting of the rat or if they are readily available try African soft fur rats (ASF) Sometimes they can be difficult toi get and pricey so I would be sure you can get the regularly. I know most some people say they dont get hooked on them but I believe they do. I had 3 BP's that were ferocious rat eaters until they tried their first ASF. Now thats all they eat! LOL

Good luck and best of luck to the snake. Im sure things are ok