Latest update: about 10 minutes ago, she deficated, looked normal. First bowel movement that I know of all morning since daybreak. Right before she did the deed she grew somewhat anxious and afterwards, so I checked the box and sure enough, chicken poo.
She definitely seems more responsive, so I decided to let her join the other girls. She drank water with the rest of them. So I know she can drink and eat, she just still is out of it, off to the side, dazed and confused.
I will check on her in a bit to see what gives.
Thinking we may have to bring her in for the night. Hopefully she comes out of it, lays an egg...
That's all for now.
Will update hopefully with good news.
Thanks to everyone who had lent a hand!
...JP