One of my chickens has a green foot. I think it's green muscle disease. I think it's due to the lack of exercise she does since I give her opportunities to exercise but she likes to be stuck in a dark corner all the time. Is there any way to cure the disease and I'd I can't cure it, is it fatal?
She's too scared to be with the others since they keep pecking her. It's gotten to the point where they don't like her to eat even when they're done. She freaks out whenever they put their beaks close to her too.
Green muscle disease is mainly seen on the breast muscle of broiler chickens.
So very unlikely the green you see on her foot is disease.
Photo is relatively dark, so if you can get some more photos that are in better lighting and clear, that may be helpful. A few photos of the hen and of her poop would be good too. Thanks!
Green coloration on the foot like that is probably bruising from injury.
You mention she's too scared of the others, hides in dark corners and is not getting to eat.
Move her to her own pen or coop. If that's not possible, then cage her, but block off a couple of sides so she feels more secure/protected, and the other chickens can't gawk at her so much. Provide her with her own food/water but place them where the others can't reach in the kennel or her space.
Has she always been lowest and picked on or is this a new behavior?
Does she lay eggs?
Do check her over for lice/mites, look her over for any more green tinted skin which would indicate further injuries. See that her crop is emptying overnight as well.
How much space do you have in your coop/run (sqft), how many birds?
Sometimes multiple food and water stations need to be provided to ensure all birds are able to get to food/water.