Have no idea. I'm so sorry.
 
How old was she?
 
I searched those symptoms but I don't know if this is what your hen had. Here's what the search came up with:
 
 
Infectious Bronchitis:
Symptoms: Coughing; sneezing; watery discharge from nose and eyes; hens stop laying.
How contracted: Viral disease; highly contagious; spreads through air, contact, and contaminated surfaces.
Treatment: Supportive care; 50 percent mortality in chicks under 6 weeks.
Vaccine available: Yes. Give to hens before 15 weeks of age because vaccination will cause laying to stop.
 
 
Mycoplasmosis/CRD/Air Sac Disease:
Symptoms: Mild form — weakness and poor laying. Acute form — breathing problems, coughing, sneezing, swollen infected joints, death
How contracted: Mycoplasma disease; contracted through other birds (wild birds carry it); can transmit through egg to chick from infected hen.
Treatment: Antibiotics may save birds — see a vet.
Vaccine available: Yes.
 
 
Pullorum:
Symptoms: Chicks are inactive, may have white diarrhea with pasted rear ends, breathing difficulty, or die without symptoms. Older birds — coughing, sneezing, poor laying.
How contracted: Viral disease; contracted through carrier birds and contaminated surfaces, clothing, and shoes.
Treatment: Destroy all infected birds — birds that recover are carriers. Most chicks infected will die.
Vaccine available: No vaccine, but there is a blood test to find carriers. While the U.S. is trying to eradicate this disease, buy chickens from Pullorum-negative flocks only.