Lethargic hen, loss of appetite

[Jlwennerberg9]

My Polish hen is very unwell and I am at a loss. She is just shy of 2 years old and has been extremely healthy and a great layer. About a week and a half ago, I noticed her becoming more sleepy throughout the day. At that time, she was not lethargic, very much alert, just more sleepy than usual. 8/5 was the last egg she laid and her appetite has become poorer and poorer each day. She also has begun losing feathers, so I assumed she was beginning a molt and that is why she has been feeling so crummy. However, she was also having greenish, sometimes frothy poop so I was suspecting coccidiosis or worms. I started her on corid and was drenching her daily in addition to the water mix. I also started giving her fenbendazole prior to losing her first feathers, otherwise I would've held off that. She was going to roost with an empty crop at night.

She has just continued to decline as the week went on. Her appetite is so poor now that I have been syringing wet mash and egg yolk onto the side of her beak to get any nutrition at all into her. Last night she became so lethargic and wouldn't eat at all that I decided to give her NutriDrench despite the corid treatment. I was worried she wouldn't make it through the night. This morning she is even worse, extremely sleepy and has only eaten a few bites of scrambled egg and some blueberries. Her comb and wattles are pale today and she's having green poop with yellow liquid. I have continued syringing her egg yolk and nutridrench/poultry cell which seems to perk her up for a bit but then she goes right back to sleep. This is way beyond feeling awful due to a molt in my opinion. Does anyone have any ideas what could be going on with her?

First attached image is her poop 3 days ago, second image is last night, and last image is today.