I would try again in 7 days, and keep repeating til she eats. It is like feeding kids broccolli, they refuse to eat it for a while but they eventually get hungry

I wouldn't leave a live rat in there overnight, ever. I am not trying to scare you out of live feeding, I think live is fine when you do it right. When you do it SUPERVISED. Expecially with a rat. They can inflict a lot of damage on your snake.
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