My Barred Rock Hen just laid a white egg (her eggs are normally brown) and she is not acting normal. She is the top in the pecking order yet is not asserting herself as usual and is a bit lathargic. The feathers around her neck are also strange looking and she has a patch of feathers missing under her beak. I have quarantined her- but don't know what else to do or what it could be. Any thoughts?