Update 8:45A:
She was up before us, patiently waiting for food. She looks worse this morning, but I think that's because everything in her system had been processed, and she needed a food "re-load". After the dosage of therapeutics described below, she's now (9:30A) outside with her sis doing what they do
Based on the information in the first link in post #31, we're changing her treatment plan slightly by adding the prednisone and backing off some on the Rooster Booster crumbles, giving her a couple of crumbles in each mix therapeutic mix. We're also cutting back on her Selenium intake by about 50%, opting for 25mcg twice per day where we were giving about 50mcg twice per day. Last, we added fresh cooked egg to her therapeutic food in place of the larger amount of Rooster Booster. So, her therapeutic mix looks like this at the start of the day:
About a Chapstick size cap-full of Starter Mash
About a Chapstick size cap-full of fresh Fried Egg
About 1/2 a Chapstick size cap-full of Yogurt (strawberry flavored if you care)

About 1/5 of a B-Complex tablet
About 1/3 of a 5mg Prednisone tablet
Just under 25mcg of Selenium (dropped to once per day)
One (1) 400IU Vitamin-E removed from its gel capsule.
Afternoon treatments are adjusted to remove the Selenium (still have Selenium in the egg she's getting) and reduce the B-Complex.
How we do it:
We mix the Yogurt and Starter Mix together, crush the hard tablets in a mortar/pestle, then mix it in with the egg, adding the Vit.E at the end, mixing it all up until we have a dose about the size of the last joint on a man's index finger, and make sure she eats ALL of this. This morning, I offered her the Starter Crumbles AFTER the dose, and she ate for another 5 minutes, so that was good - still can't get her to drink on her own, so that's a manual operation for now.
Though she looks worse from the head-hanging perspective, she's alert, whistling, chirping, and making all the other little happy sounds that chicks make. We're in this with her for the long haul! We will NOT give up on this chick! She's such a doll and a pleasure to have with us.
NOTE: Something I failed to mention about this chick is her origin. She was hatched at our home on April 03 of this year. We have a Silkie rooster and three (3) eligible hens that give us baby chicks each spring. The Rooster came from one flock, and the hens from another, so we're confident there is no in-breeding, at least in that group of adults' generation. Further, we won't allow two (2) other Silkie hens we have to mate with the Roo because he's their daddy...

We ONLY allow eggs to hatch if they come from those hens that aren't his offspring.
Wondering why I have the camera out again this morning...
But eating her Starter Mash after her dosing this morning. Food is just WAY too important to worry about photographers!