Has she molted this fall? Combs/wattles can become pale when not laying or molting.You may want to try to get her drinking water and offer some chopped egg or wet chicken feed, just to see if she will eat or perk up. Poultry NutriDrench or Poultry Cell are excellent to use orally 2-3 ml daily, and contain vitamins, minerals, and other nutrients. Give her an examination, checking her crop to feel if it is hard, soft, empty or balloon-like. Pick her up and feel of her breastbone to see if she has lost weight. Place her in a dog crate on paper towel or an old towel to check droppings for diarrhea or blood. Look her over for mites or lice on her skin under her vent and elsewhere. Worms, mites, coccidiosis, crop problems, or a reproductive disorder such as internal laying are common problems with hens. Let us know what happens.