Please watch the video in the link to help me identify what this chicken may have

[FLBYChickens]

Cough/Sneeze/ whatever it is sound can be heard at 0:45 and directly before the end of the video

Symptoms:
Somewhat watery eyes, may be normal but you will see in the video
Bubbles in eyes, most common in the morning
Makes that cough or sneeze sounds as heard in the video
Nostrils always wet
Poop normal
Walk/run normal
Eating normally

She was very ill about 3 weeks ago but has since improved after administering tetracycline. Her symptoms at that time where as follows:
Lethargic
Eyes closed
Head sunken into body
That cough noise or whatever it is
Bubbles in eyes
Nostrils wet
At one point I also believe she had discharge from her mouth


Link to video:

 

[PeepersMama]

Her eyes look normal, and for the most part she sounds normal, except for that sneeze.
If the medicine you're giving her is working, keep giving it to her. Keep her seperated from the others until she shows no signs of a sneeze, because respiratory diseases can be fatal.