Weight loss and weakness, can be the result of inadequate food intake, the body using excess calories to
fight infection, diarrhea, a heavy parasite load (internal or external), or can even be a metabolic disorder.
Your hen is very weak, which accounts for the slow walking and stumbling. She may be anemic from fighting infection, and most likely has at the very least, loose stools.
You need to increase her caloric intake by manually feeding her, if she is not eating substantial amounts of food. Sprouts and vitamin water will not increase her strength. Not even the Liquid Hepato will help, if she is lacking nourishment. The Lily of the Valley should not be used if she is weak. As, it has dandelion root in it, and will cause her to make urine. If she doesn't drink enough water she'll dehydrate. Just use the Liquid Hepato, till she is stronger.
If she were mine, I would start feeding her manually with a syringe. Or, if you know how to tube feed that would be good too.
She needs a bird replacement powdered meal. Personally, I use Hemp Protein Powder for critically ill birds. The powder should be mixed with warm water to form a pancake batter consistency. You can also add Manuka Honey, coconut oil for extra fat, etc. You can make your own by pulverizing some of her feed with water in a blender. It must be smooth enough to pass through the hole in a syringe. Feed her at least 40 ml, per day. I feed 8-10 ml, four to five times a day.
From what you describe, it sounds as though the hen is in critical condition. She can go downhill suddenly and death can follow very quickly if you don't start to treat her more aggressively.
- Once a hen is stumbling, they should be isolated, so they expend as little energy as possible. They cannot compete for food, or deal with the harshness of the environment when they're in a weakened state.
- Bright green poop and yellow urates, she has an infection. Without a good antibiotic, she will not survive the week. She should also be on a broad spectrum antibiotic: Enrofloxacin or Doxycycline.
So, these are revised thoughts on your hen's issue. I hope I have been helpful.
God Bless and good health to your hen.