I have a 6 month old Dominique pullet that is jaundice looking. Her comb and wattle are pale, and her skin looks yellow. Her vent is yellow as well. She is eating and drinking but, usually stands around slightly puffed up. She does not feel thin but, is not as vibrant as the others. I do not use any chemicals so she has not been wormed. I use ACV in their water and DE in the coop and run. Is there anything I can do? Or should I just cull her for possible liver failure? Thanks.