Thank you to everyone who gave advice! Lucy ended up getting about 85% better after treating with a broad spectrum antibiotic. Her comb regained most of its color, she isn’t quite as skinny, her abdomen is holding much less fluid, and she is acting mostly normal. She still doesn’t lay eggs, but that’s way ok as long as she is a happy chicken! View attachment 2264710
I'm glad that Lucy is doing better!
Thank you for the update.
If you don't mind, which antibiotic did you give her?