Are her droppings rather runny? Is the smell very strong and horrible and from the droppings? Or is it strong and nasty from her face? Or just wrong-smelling not extremely fetid, but also from her face - kind of sour nasty?
In the prescence of respiratory symptoms and a weird not but absolutely horrible smell, a sick smell instead I'd suspect pasteurella. It has a distinct smell. Sulmet will treat it if you have some.
If it's from her droppings and rank then I'd suspect one of the Clostridiums or botulism.
INcidentally, despite one person having luck with it chick starter usually doesn't fix this. I don't know what that case was about.