I’m a new chicken keeper and our chickens had seemed fine. Later on we got two more (well summers) one of the well summers died unexpectedly. We also got two of the same birds which one of them was disabled and passed away while the other got sick mysteriously and passed away recently. We got two more and one of them looks sick her skin looks grey and being pulled by lots of feathers. She has golden feathers so I’m wondering if I should worry about her skin. Her neck looks smaller than her head which is unusual for our chickens. She also looks slightly smaller than the other one we got with her. Her droppings are big and round. Has she gotten sick and is there a diagnosis I can do?