Is she pooping on her own and eating? If she is pooping that is going to be a good sign. If she injured her spine she may/may not heal and return to normal. I had an ig paralyzed in the rear and I had to help him defecate. He could not use his rear legs at all but over the course of a few years I saw more and more function return but to a very limited use.
I have no idea what your cage setup looks like.. But iguana's are usually a very very durable creature. The diet needs a mix.. Usually by adding new items chopped up finely and fed in small amounts works.. Proper UVB lighting is a must. Never good foods you want everything to be raw and fresh.
Call local vets.. Look for an avian (bird) vet. If you find a vet that commonly works with birds but not reptiles.. Well you can give them a shot.. Vets can consult with others (sometimes with a consultation fee). The quicker your ig sees vet the better off it will be.