Some are just picky eaters. I would go ahead and try a live meal, but I would start very small (like a weaned rat - just a bit smaller than a small rat).

I would also make sure you have two small hides available, one on each side. You might also want to try the newspaper 'trick'. Toss in some loosely crumpled newspaper, just in case it's a security issue.

Good luck and let us know how it goes with her.