If the snake was already feeding reliably, it doesn't need to be retrained to rodents; it already knows that mice are food.
My hogs will go off food for a month frequently enough (and the male usually won't eat when his mind is somewhere else), and then return to eating with a vengeance.
If the snake is setting up for brumation, it isn't likely to be active as normally. Mine currently are slipping into their winter mode (they do get brumated), and are off their heat and acting sleepy.
Knowing the snake's history and so on like Bogertophis mentioned is going to be critical for figuring out how to proceed.
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