Welcome to BYC. Swollen eyes usually mean a respiratory disease in chickens. Is there any other symptoms such as watery eyes, nasal drainage, sneeze, wheezing or rattles when breathing, or any bad smell to the head? Diseases such as mycoplasma (CRD) and coryza can cause swollen eyes with some of the other symptoms. Drugs such as Tylan and oxytetracycline can be given for treatment of mycoplasma, and sulfa drugs may be used to treat coryza, but these diseases will make all of your chickens carriers, and can never be totally cured. Can yougivea few more details about the age of the pullet and where she came from?