Chytrid does not cause them to not be able to move their limbs. It prevents them from absorbing water and moisture through their skin., but that does not mean that she may not have it. Some carry it. I wish there were more help we could provide. Perhaps you could find a Vet that specializes in Amphibians and see if they can offer assistance. It could be anything from a neurological problem to a vitamin deficiency. Possibly even MBD( Metabolic Bone Disease).
Seek out the assistance of a Vet. This is your best chance to save her.