Hi Z,
if she takes another turn for the worst then syringing her with water will prevent her from dehydrating. A syringe of olive oil will softed a dried out crop and a gentle massage of the crop will help to move things through her. Feeding her chick crumbs may be appealing and easier to manage and the added protine and anti biotic contained can help.
I have had the same thing in two of my birds. As a result I'm now affraid to use flubenvet.
Buffy