Is she eating & drinking? Mine is not, but has same symptoms you describe. Did you check her crop?
That's exactly what's going on with my hen- pale, shrunken comb & wattles, low activity level, runny yellowish poop- (I didn't look at the link you posted for color). Mine is not eating or drinking and has been acting 'anti-social' for several days. I didn't pay attention to it at first b/c we had really bad weather several days ago, and that next morning were short an egg, but figured whichever one was just really spooked by the storm. Then my hubby said one of them didn't get off the roost last night when he put them up, so I watched them this AM to see if they were still acting different.
I thought my hen might be eggbound so I started checking her out, and her crop was really full & super hard this AM when I checked on them, so I have treated her for an impacted crop 2x so far. Her activity level picked up a little in between sessions, but she still wasn't eating or drinking that I saw, except that she quite eagerly drank the oil I offered her.
Your post has got me wondering if maybe something else is going on now too...
