have you tried the switch yet?
I technically switched my girl to f/t. She was fed only large live mice at the breeder's, and when I got her, I tried to be consistent. I used a slightly small f/t mouse, and got it all warmed up, and then did the zombie dance.
It's usually best to not change a lot of things at once. So if you do want to switch to f/t you should probably at least keep the same species/size, or maybe even a little smaller. Feeding a small live item first I've heard can work well too. Especially if you're currently feeding multiple items anyway.
How old is she? The young'uns apparently switch easier.

Once you get her onto f/t mice, it might be easier to get her to rats if you still want to