katharinad - Thank you for the information. i have silkies and am aware of their tendency towards neurological issues, as well as brain injuries. Should have made the connection here. Will get vitamins in their water pronto.
i just looked and i have some Avia Charge 2000. Doesn't list the ingredients on the label, but says "This performance enhancer contains 70+ naturally chelated minerals, 23 vitamins & antioxidants, 22 essential amino acids, enzymes, and body & blood building nutrients."
The little one actually looks a bit better today, still small, but she is eating and drinking with the rest of the flock. That's a good sign.