Switching from mice to rats can be easy or very hard it depends on the snake. Try offering her a small weanling size f/t rat and she if she takes it. If she doesn't try rubbing a rat on a mouse to sent it and that should work. If it doesn't work at first keep trying.
Bloods are illegal in Maine where we are so we have not worked with them , but from what we do know on them keep them humid with some sphagnum moss to hide in and offer live rat pups as food. Bloods love rats and that is what they want. Good luck.

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