Infectious bronchitis usually causes sneezing, and a little nasal drainage. If you are seeing foam or bubbles from the eyes, then you may have MG or mycoplasma. Are you seeing any bloody mucus or foam, which can be a sign of ILT. MG can be treated with Tylan, Gallimycin, or oxytetracycline. IB is a virus, and there can be secondary bacterial or viral infections. If she is blown up, she may have a leaking air sac or subcutaneous emphysema, which can be from an injury to the neck or chest, or possibly from an infection of the air sacs or air sacculitis. a leaking air sac from an injury may be deflated with a needle from 18 gauge for a grown chicken to 22 gauge for a chick. Testing or a necropsy on a dead chicken is the only way to find out what you are treating since many diseases may have similar symptoms. Here is a good link to read about common diseases, and more info on a leaking air sac:
http://edis.ifas.ufl.edu/ps044
https://www.backyardchickens.com/t/171121/deflating-subcutaneous-emphysema
http://ijasvm.com/ijasvmadmin/upload/IJASVM_5113cbc51d31b.pdf
http://edis.ifas.ufl.edu/ps044
https://www.backyardchickens.com/t/171121/deflating-subcutaneous-emphysema
http://ijasvm.com/ijasvmadmin/upload/IJASVM_5113cbc51d31b.pdf