Is my chicken choking now? Emergency! help please.

[JuliaSunshine]

I gave her Biomectin for worms and she seems better. No more loud breathing and her appetite improved. I'm still keeping an eye on her. Thank you.

She died a few days ago. She seemed to have gotten better for a few weeks but she got slightly worse again.
I thought it was gape worm again because she possibly spat some of the medicine I gave her the first time.
I separated her again and she breathed better but then she died within a few days. I think she had respiratory infection after all.
Next time if any of my chickens gets sick I'll bring bring her to a vet.