Sorry, you haven't received a reply. How is she doing today?
You mentioned there are other symptoms? Could you elucidate on that? Any sneezing, eye discharge, rattled breathing, is she eating and drinking well? Could you post pictures of her poop? Have you checked inside her mouth for plaque deposits or lesions of sorts? Are both eyes swollen?
It could be a respiratory disease, such as MG, IB, or Coryza. This is how they often start out, then you begin to see sneezing, etc. That would explain why the amoxicillin had little effect.