If getting fecal test isn't doable (many vets won't do it without seeing the bird. If you have a vet for other animals it cost nothing to ask) then I would consider worming her to see if it helps. I would use Safeguard liquid goat wormer or Valbazen (labeled for cattle). The Safeguard is usually available locally, the Valbazen usually has to be ordered on line. Generally you won't see worms in the droppings, they live their entire lives in the bird and are digested when they die off. Without a fecal there is no way to know for sure.