Did you worm the whole flock? I am going to go against the flow, and suggest you get yourself some equimax horse paste wormer ASAP. If i remember correct it had ivermectin in it, it will kill all kinds of worms and should kill any lice or mites as well, which your neighbor's chickens may have come home from the auction with.
Worming individuals "as needed" may be optimal, but unless you have the $$$ to get them all tested, you will not know their exact worm load. Different hens may react to worms different, but they have all been exposed. Some worms will take all the nutrition and they will starve to death, some suck blood and make them anemic, some are so tiny they can swim in the capillaries and shut off blood flow! I have seen people advised to do the "regular" wormer first in the case of a severe case, so the worms don't all die at once and clog the hen up.
PM me if you want. I wish i could come over! Definitely give her some of the showbird, if you still have some. I would only feed her that until she perks up, at least a day or two. Or get some liquid vitamins.
Speaking of worming, I spent several hours yesterday catching and orally dosing my chickens with 1/2 ml Ivomec. I lost a hen Monday night to what I believe was worms. She had been having watery diarrhea and then laid two shelless eggs. I finally caught her Monday night and cleaned her butt up, trimmed the feathers and pulled out the rest of an egg that was hanging from her vent. Since this was the first time I had held her I didn't realize how thin she had gotten. I put her in a carrier and tried to get her to eat some oatmeal but she wasn't interested. I finally covered her up and decided to try again in the morning. Around 2:00 a.m. I heard her banging around in the carrier and knew she was in her death throws. I checked and she had passed. Poor girl. I had wormed them in May and since no one else was showing symptoms I thought she was just prone to diarreah. She acted normal in every other way. No eye or nose discharge, eyes clear, feathers good, no lice or mites, eating with everyone else and drinking good. Well, I thought no one was showing symptoms, but also read that a pale comb and wattle can also be a sign of worms and one of my Marans hens does have that. So, yesterday after dosing everyone I came back in the house and spent some time on BYC re-reading what I could find on worming. Now I have read that Ivermectin is not the best for worming, but Valbazen and Safeguard used alternately gets every kind of worm they could have. Dawg on the Emergency and Diseases thread is pretty knowledgeable as well as several others. See https://www.backyardchickens.com/t/576036/necropsy-results-is-not-coryza-or-crd-parasites-are-rampant/80. So, in 10 days I will retreat with Valbazen and hope I get them cleaned out. Anyway, I was also burning two huge piles of brush from the oak tree that finally fell into my pond. Instead of burying the hen I threw her on the fire and cremated her. A half hour later my neighbor calls to tell me that my chicken on the grill is killing her! I did smell good.

Edited to say IT did smell good, I didn't.
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