Chicken not looking healthy?

If you have the money, I suggest that you take her to a veterinarian. Otherwise, make sure she has plenty of nutrition. Her pale comb could be a sign of calcium deficiency. Give her eggshells to eat, and see if that helps. She is probably grieving over what happened to the chicks, so give her some time. If she isn't getting any better within one week, take her to a veterinarian.