I would start vitamins in her water or food, or use a product such as Poultry Nutri-Drench or Poultry Cell by Rooster Booster, that contains the mineral selenium, along with thiamine (B2) and vitamin E. Did she have a Mareks vaccine?
NO vaccination. My others have that (those that I buy from a hatchery) but I got her from someone who raises these.

I have the Nutri Drench and the Rooster Booster (just went downstairs to get it and read your post! We're on the same wavelength). Will start that tomorrow.
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