For those following: The preliminary findings from the vet that I dropped the bird off with- my bird looked very healthy- no pneumonia, bronchitis, not even any parasites. Said all her organs, lungs etc looked good but he's sending her trachea to the state lab to see what they find and he'll call me as soon as he hears something, expects it to take a day or 2.
SO now I'm googling tracheas. Noticed one of my other hens kept trying repeatedly to clear her throat....
that is 50% good news. I hope your chickens will get well soon.