Wendell,
I had one of the silkies born last month that has been weird for a while. She's always been small and her crop was always full and her poop was normal when I separated her. I found her today dead and she had the watery ick like your small Dom. did. All the poop in the rest of the coop today looks normal, no more shedding this morning. She was about 10 weeks today.
I've done searches on what it could be and can't find much actually. Coccidiosis often has the fluidy like at death but then the feces is bloody. I have no idea though. But I lost the second smallest chick this morning.
Could she have been trampled by bigger birds? I didn't see any evidence of that. But that wouldn't have explained her small size. I didn't see any evidence of pecking from the suspected pecking incident yesterday morning.
I am going to finish a section in the house today for the smallest of birds.
http://www.cd3wd.com/cd3wd_40/LSTOCK/001/SA_InfoPaks/docs/gut/default.htm