Well what I think would do is maybe do a trail sometimes I don't know about cats but they have to have some will power so try Cod Liver Oil to lace on the sardines or something. Its smell is strong, and I used it to cover up pill taste. Another idea is trail the food into the cage, I'm sure you tried this but hey I think I should mention it at least, she may forget about her worries once she starts getting a taste of that food.

I also might try dangling a mouse toy preferably a realistic maybe even rabbit fur fresh one, no other cat scent on it. Just another desperate attempt to lure the girl in.