I just cannot see that this chicken would have fowl cholera (pasteurella.) She looks very alert and chickens with cholera are very sick, lethargic, have runny eyes and nasal drainage, diarrhea, etc. It comes from other sick farm animals and is spread by those and rats. It is not very common in backyard flocks. To me, I think she is still swollen from the freezing temps, and the wattles are now pinking up with good circulation. Swelling is affected by gravity, so increased circulation may be causing all the edema in her wattles and legs.
Just keep giving supportive care, and hopefully in a few days, she will be back to normal. Keep us updated, and good luck.
Just keep giving supportive care, and hopefully in a few days, she will be back to normal. Keep us updated, and good luck.