Well, I am happy to report that all 15 chicks made it through their first night with me as their mother. Today is Thursday and they are now 3 days old since hatching out and shipping on Monday.
ALL are eating and drinking regularly. This includes the chick I was having problems with (and now another -- see below).
The original problem chick ("W1" I am calling her for now), was in the condition I reported above when I left her for a few hours last night. I thought I was seeing gradual improvement. When I returned last night, she lacked the energy she had when I had left. Not sure what to think of it, maybe she was in a nice deep sleep the whole time and just not coming out of it easily when I saw her later? Anyhow, this morning, she still seems to be somewhat better then her best condition of yesterday. Eating and drinking regularly. Seems as though she is getting up and re-situating herself more often which is good. Nice short exercises.
I have another chick "W2" that has become a bit of a problem for us. I think the symptoms were there yesterday, but I was too overwhelmed with W1 that I may have just overlooked the situation. She is also a sleeper. When she is up, no problem eating or drinking, standing or walking. BUT SHE LIKES TO SLEEP!!! My wife first noticed it while I was out last night and I confirmed that she didn't awake the entire time I was out for 4 hours. I put her in the separate box with W1 and both were thankfully alive this morning. They are still in the box together today.
When they are awake, both are alert, attentive, want to eat or drink. Pooh does not seem to be an issue either. Nothing to do but go visit every hour or so and wait wait wait......
By the way, W1 & W2 are both Welsummer chicks, hence the "W". No, I, I'm not going to name my birds for real.