Maybe someone already covered this and I just missed it, but mice and rats have two completely different smells. In my experience, feeding a prey item that is unfamiliar to the snake is usually a tough sell.
An example here is an Orange Dream girl I received in a trade a few months ago. For the first month, I tried scenting rat pups for her, since I knew she had been eating mice. This didn’t work, and she is still very young, so of course I had to put a mouse colony together just for her (I breed my own rodents). She hasn’t missed a meal since!
TL;DR Try rat pups, because mice smell funny.
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