Yup, both braining and scenting can be done to a f/t rodent. There's also the "chicken broth" method, which I've seen mentioned but haven't looked into. If she's eating two mice in one sitting(?), start with a mouse, then follow up with a rat of similar size for the second meal.

Mice and rats smell different to a snake. You just need to her to realize the different-smelling-fuzzy-thing is still tasty food. Hang in there! You're doing the right thing for her in the long run, even if it takes a little tough love.