I'm glad you are getting some info back.
Looks like they are not able to tell at this point if it's Marek's or LL, could be some of other disorder, but these 2 are the most common it seems.
With both diseases, often you can learn to manage symptoms by offering supportive care and see if they...
Calcium Citrate or Carbonate with D3 will be fine. Give her around 600mg, just pop the pill into her beak and let her swallow it.
Lost some tail feathers but doesn't seem to be molting - you may want to examine her to make sure she's doesn't have some type of injury.
Molting usually starts...
Can you post photos of her and her foot?
Is she molting?
She's not laid an egg, if she should be laying, you can give her Calcium Citrate for a few days to see if that helps her expel an egg.
Is her crop emptying overnight?