Greetings apryl29,
There were similar symptoms in my New Hampshire hen over a year and a half, ago. Poops were clear watery, mucousy, some digested feed, and yellow substance/urate. She was eating and going out with the flock, but something just seemed off about her. She had yellow poopy butt, too. Normally I prefer to treat my hens, but, something told me this was out of my ability.
On the second day after noticing her poop, she started to eat less, and fluffed up. I took her to my Vet that day. As soon as he saw her poop, he advised we should do a CBC, and a fecal float test. The CBC indicated a severe internal infection; the fecal float test showed no worms, no coccidia.
He prescribed enrofloxacin injections, medication for diarrhea and Liquid Hepato for liver support. He suspected that the yellow in her fecal matter, was an indicator that her liver was stressed by the infection. The CBC confirmed this.
He was unable to determine the cause of the infection, but said it would have been fatal without medical intervention.
I brought her home and put her into the hospital crate, administered the prescribed care, and she recovered in three days. Then, I returned her to the flock, and continued her medical care for seven more days. She has had no further health issues, and is one of my best layers at 3 yrs old.
I believe in holistic healing and prefer to use herbal medicine, but, sometimes you just have to defer to a good Vet.
I hope this was helpful.
God Bless to you and your hen.