Hi there. I have a 4 week old chick that I recently had to seperate due to some bullying issues (she was the bully.) I've now moved her back into the brooder but she hasn't been the same - eats when I bring the food to her, but stands in a corner under the heating lamp with puffed wings, continuously chirping. Puffing doesn't seem to go down and she sleeps more often than the others. Should I be concerned? They're on starter feed with ACV in water.