Yesterday one of my 7-month old SLW hens was lethargic and sleeping on the floor of the coop, something I've never seen her do before, but when the rest of the flock went out, she followed. She wasn't interested in treats but pecked around the pasture. It's been cold, near freezing, for several nights now and many of the girls are puffed up in the morning, trying to keep warm. They're slower moving than usual until it warms up in the late morning when they perk up again, and until two days ago they'd been laying 20+ eggs per day. Today, the SLW I mentioned was laying inert on the coop floor. She didn't even look at us when we picked her up. We could hear a slight rattle or wheeze when she breathed. Also, her rose comb and wattles had turned dark purple overnight. I isolated her and put her under a heat lamp, then tried to get electrolytes and vitamins into her as well as plain yogurt but without much success. Within 15 minutes she was dead. The other birds seem okay but I'm concerned because they only laid 6 eggs the day before yesterday, 8 yesterday, and only 13 so far today, and the lethargy in the morning is new (I thought related to the cold nights). Any ideas? I think the purple comb may have been from lack of oxygen rather than the cold. (?) And I think she may have had a rapid acting respiratory illness. I would appreciate input from anyone who has experience with something like this. Is there anything I can do to help the remaining flock? Any treatment I can offer if another hen or hens becomes ill. I'm not sure I'd even be able to catch it quickly enough and I'm out there several times a day, but I'd like to have SOMETHING I can try. Thank you in advance for any help you can offer!