She looks like she feels awful. Her imbalance is likely from not eating enough. Are you set up to tube feed her? It's the first thing I would do. Get half a cup of food and water into her laced with Nutri-drench.
Can you post a photo of her poop?
Losing two other hens and now this one being sick, it may be a bacterium making these chickens sick. Or coccidiosis. It wouldn't hurt to do a round of Corid to cover that base. I would also start her on an antibiotic and see if that improves her state. Include a drench dose of undiluted Corid in her tube feeding. It's .1ml per pound of weight once a day for three days.
If these measures don't help, then it's something a necropsy is going to have to find.
Can you post a photo of her poop?
Losing two other hens and now this one being sick, it may be a bacterium making these chickens sick. Or coccidiosis. It wouldn't hurt to do a round of Corid to cover that base. I would also start her on an antibiotic and see if that improves her state. Include a drench dose of undiluted Corid in her tube feeding. It's .1ml per pound of weight once a day for three days.
If these measures don't help, then it's something a necropsy is going to have to find.