My bad, I forgot that she was 14 weeks old... How does her poop look and smell? Coccidiosis is always a concern when they are younger. If you can post some pictures of her poop, I might be able to tell you if it is. Chickens get many types and the different strains live in different parts of the intestines, so the more pictures you can get, the better. I've also noticed that birds with coccidiosis have very smelly poop. Treatment is amprolium (Corid), since Sulmet is only effective against two types that chickens get.
Kaytee Exact is what you want.
Kaytee Exact is what you want.