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Looking at the video, that is not panting. It looks like she has something down her throat or its her crop.

You said the vet test the fecal test came out fine for all three. I am assuming worms. There are more than three types of worms. Heres a link. http://msucares.com/poultry/diseases/disparas.htm Its possible she might have Gapeworm, or something is stuck in her throat, you could put a feeding...

It should be completely flat.