Are you sending her for necropsy? I would if you can..I'll tell you what just went through my feeble brain.....metal disease or something like it. If this wasn't a Marek's and with the fever it doesn't sound like it, she had something bad. There are a lot of diseases that will cause fevers as well but I have no idea where to even start. That's why I am saying it sounds to me like a peritonitis or like that. Just FYI, on my bottle of Sulmet, it says to treat for 3 days for Coryza and things like that, not 5. Be careful of the dosing. Sulmet is a very strong and harsh sulphur drug and while in some cases it would be the drug of choice, you need to stick with the recommended amount and days. Think of it like battery acid and use sparingly. Di-Methox is a better choice as it's easier on the system.