Last night (about 9 pm) when locking up my birds I noticed one Hen (golden comet) was laboring to breathe and had a little bit of a rattle. She had no discharge from her eyes or nose, no swelling anywhere, her wattles and combs looked nice and red. She coughed one good time and the rattle disappeared but she still was breathing heavily. I separated her from the other chickens and figured I'd get to work treating her in the morning. Well she died in the night (kinda figured she would). No other chickens are showing symptoms or acting off in any way. Does this sound like a respiratory infection or does it sound like aspiration of some kind? Gapeworm?? I originally thought IB (Infectious bronchitis) but now I don't know because she died very quickly. Other chickens have rooster booster and ACV in their water today and I'll be getting Vet RX to help them out, but does anyone have any experience with this? With the Covid pandemic I don't think Cornell will take her for a necropsy. Thanks for any info you have!