Please post some photos of the chick and her poop.
9 days old, I would suspect Coccidiosis. Do you have any Corid?
Liquid Corid Dose is 2tsp or Powdered Corid Dose is 1 1/2 tsp per gallon of water.
How much space in the brooder. Temp is "normal" what is it on the thermometer - cold side...