My pekin died in 2 days of coughing and congestion, bronchitus and pneumoonia blood work needed to solve and medicate,The stress will affect other organs.
I typed on Goggle the best avian Doctor in Seattle, 83 miles from where I am located,try on line to locate an avian vet who must identify what bacteria or virus you are dealing so the correct diagnosis and treatment can begin. Birds have a complex respiratory system.
I have stopped using staw or shaving to much moisture,I had a 34 yr old cough for 4 days it was on Thanksgiving she died 2 days later after a necropsy they said broncitus and Pneumonia so be careful and get her help soon!