I have this girl that lays down often during the day. Is that normal? It also appears that her comb is pale. When she is up and about she walks normal. Pecks and scratches around like normal. I see her eating and drinking as well.
Chicken laying down often
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How old is she? Has she been molting recently? Is she eating a drinking? How do her stools look--any diarrhea? I would recommend worming her if she hasn't been recently wormed. Valbazen 1/2 ml orally then repeated in 10 days is good. Also look her skin over for evidence of lice or mites--tiny insects or their eggs. Mites can cause severe anemia.
Molting can be very hard on chickens, and moving to a new homw can be stressful as well. Being on new soil can also introduce them to coccidia strains that they are not immune to. You could send her body (refrigerated) into your state vet for a necropsy if you want to know what was wrong. I would check the others for lice/mites and worm them. If you see any hunched or lethargic, having diarrhea or blood in droppings, or refuding to eat, then I would treat them with Corid for possible cocciddiosis. Sorry for your loss.