I picked up 3 new chickens last week, among them two light 1 yr old Brahma hens. One hen, Rose, has a light pink comb/facial/wattle area. Her sister's is bright red. Now Rose has diarrhea - medium brown with a touch of green, like very thin pancake batter. She has a bit of staining on the back of her feathers (no clumps/vent buildup). (of course, white brahmas do have a lot of fluff back there...) It shoots straight out of her. Also, there seems to suddenly be a lot of white brahma feathers on the floor of the run. Could this be just cumulative stress of a move/some new coopmates/etc? She and her two friends were supposedly laying when I got them, but I've yet to see an egg. Their new accommodations are an improvement over the old, with some backyard free range time as well. All other chickens appear healthy. Should I wait and see, cull her, or is there a clear diagnosis for her symptoms? Any suggestions?