I just came home from a 14-hour day to find my hen which had had the prolapse now has some sort of torticollis. Since she was fine this morning, I suspect an injury rather than a vitamin deficiency. Nothing appears to be broken, and she can sort of straighten up and take a few steps before she goes back into the stargazing, head-flipped-on-back position. She's also missing some feathers on the side of her neck, which makes me wonder if she tried to elude the roo or a higher-ranking hen and had her neck wrenched.
I have her back in the Hen Hotel (she was Not Pleased by that development). Of course, I'm out of syringes when I need them (ARGH - I'll get some 1 mL dosing syringes from work tomorrow), so I dripped high-concentration vitamin and electrolyte solution on her beak using a spoon (some BroilerMax powder mixed in about 12 ounces of water), which she did take. I then made a really wet mash of feed and more solution, which she practically gobbled down, and put the rest of the solution in a chick waterer for her, because it won't hurt, and may help somewhat. I'm going to let her rest overnight and reevaluate her in the morning. We've agreed that if she does not improve or worsens, I'll do her, and then we'll bury her, as she's a pet. The good appetite is a decent sign. Here's hoping.
This little, messed-up thing is one of my favorite hens, so I'm willing to put the time into her to try and save her.
Edited to add that both eyes are clear, her pupil reflexes are normal on both sides, and there is no discharge from anywhere, which makes me think "injury" rather than "disease process."