2 years old hen with heavy breathing problem

[alt2mn]

About 2 weeks ago, I noticed 2 years old hen has opening mouth and heavy breathing. She eats, drinks, pooped fine. I gave her some antibotics amoxicillin 250mg 2x a day for 7 days. She still have heavy breathing but not as bad, her mouth is open slightly when breathing now. Everything else seem ok. It has been getting cold here at night like 36F, she started molted a month ago still filling in the new feathers and she is in the coop with the rest and the rest all seems OK and healthy.
Any suggestion what I should do besides just waiting for her to get better? I have video but can't find a way to insert

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[alt2mn]

 

[Debbie292d]

Hi, sorry about your hen.

To post a video, post in either YouTube or our Gallery (tab above) first, then copy the link here.

I would get her on vitamins and probiotics now for a couple of weeks for post-antibiotic treatment, but those won't help with breathing issue. At least that's better now, so perhaps she'll continue to improve.

Do you hear any wheezing or rattling in her chest?

I think it'd be good if you could post the video though.