no. sorry for the late reply. I continued feeding her more vitamins and what I was previously feeding her. it seems she is now fine (no more coughing or sneezing or anything) and she's also eating fine. I guess it was a virus (like one of the fellows here suggested) and she has now overcome it...
I see thanks. I haven't yet seen any swelling or foam in the eye until now (it's been 4 days).
as for the environment. the chicken is kept in a sort of yard in which trees there. the thing is that other chickens are there too (even long before she came). but where she sleeps is a little bit...
here's a video of her.
I gave her some vitamins (B complex, C, multi-vitamin) and also some Azithromycin tablet pieces. but am I giving her the right meds?
I also don't know what causes this, can someone also tell me in what condition a chicken gets this disease?