Since they have been separated for 2 weeks, there may be some pecking when you reintroduce them. Use caution, and try to be present for a few hours when they are getting back together as a flock. It's good they are better. Keep in mind with respiratory diseases, many of them can make your flock...
Sulmet can be good for coccidiosis and for some respiratory diseases, such as coryza. It can be hard on them, especially the kidneys. After finishing treatment, be sure to give some plain yogurt or probiotics, and a few days of poultry vitamins to get their gut bacteria in order and to replace...
There are several common respiratory diseases in chickens that cause sneezing and runny nose. Infectious bronchitis is a virus and is the most common one. Mycoplasma or MG can cause those symptoms in mild strains, and more serious symptoms in more serious strains. MG can be treated with Tylan...
Does she sneeze at all? Is there any diarrhea or blood in her droppings that may be a sign of coccidiosis? Usually when they stand around hunched or puffed up, coccidiosis should be considered at that age. An underlying chronic cocci infection can stunt the growth. I would probably first treat...