I've never had any of my corns refuse f/t for long. My BPs are another story, however. Some of them can be quite reluctant, so I've developed a bit of an arsenal of tricks over the years.
The one I find has the most universal success is to dip the head of the prey item in VERY hot (near boiling, and if it does actually boil I don't consider that too hot) water for about 10-15 seconds. Then I let it cool/drip for maybe just 2 seconds, and offer it to the snake. I've had almost 100% success rate with this method, combining it with the zombie mouse dance if necessary.
With a corn, I think you would also have a good chance of success just leaving her alone over night with the mouse, as Nanci suggested.
If she's an adult, and otherwise healthy, she can go a long time without food without any ill effects at all. It won't hurt her to get a little hungry, and it will help switch her over. I'd offer food only once a week, or possibly wait longer than that between attempts. If she doesn't take the f/t, make her wait until the next time around. Just weigh her regularly, and if she does start to lose weight, you may have one of the rare corns that just can't be convinced to eat anything but live.