I've never heard that whistling sound, but she doesn't look distressed. Can you post on here with an update in the next few days?

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Will do. We are thinking (and hoping) it’s dehydration. I guess they can breathe like this when that happens. She wiggled her way out of the run we have for the younger chicks and was separated from her water for a few hours, so it’s possible.
She past away last night. We talked to someone who has worked with chickens for a decade or so and he thought it was either dehydration or she injured her esophagus somehow. It must’ve been the latter because we were able to get her a fair amount of water throughout the day but it never got better.