Alternative preys are not the answer unless you go from live to f/t , she knows how to eat, she ate in the past she just refuses to, it could last weeks, month or even a year.

Here are things that can be done

Dowsize the enclosure

Take her on a car trip 30 lin or so

Make sure your temps are optimum.

BE PATIENT

I got to ask how big is she (weight)?

Where does she spent most of her time lately (cool side, warm side)?