2nd update on my sick chicken (advice always appreciated)

I have taken all your advice (given her scrambled eggs, garlic and apple cider vinegar solution in water, salt water, hot water bottle in a pet carrier at night, preventing drafts) and also many more. She has more energy but is still moving slowly and has the need to sleep often. I am trying to get as much food and water down her as possible, her poo is more solid.

I’m not sure if it’s just me but does her comb look a little lighter than before too?

Another question but should she be laying eggs (she isn’t)?

Ok actually last question, how long should I quarantine her before letting her mix with the other chickens (we have 10 in total)?

I know nobody asked for this update but here it is if anyone wants to know.

As I always say, advice is greatly appreciated and thanks to anyone who has already given advice or words of encouragement!!!