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She was hatched in coop by momma.What is the temperature of your brooder and is the brooder inside or outside in a cold coop? This sounds neurological, but I would give it Poultry NutriDrench or Poultry Cell tonic 1 ml daily per every 3 pounds. Your chick could probably tolerate 1 ml given a drop at a time. Make sure that it is eating and drinking by offering sips of water and offer some wet feed mixed with a little egg daily.