Broody chicken deep breathing with her mouth open, neck extended, pale comb/waddle, eyes squinting

[Wyorp Rock]

Last week, I also changed food to a different brand with mixed grains, but she isn't eating as much (and doesn't like select seeds), as the previous food brand. So I'm not sure if she has a loss of appetite because she's feels unwell, or if she doesn't like the new feed.

but then she got broody recently and kept wanting to sit on her eggs. So she's essentially inside

I agree she looks hot.

I understand your concern about the Avian Flu, but do you have a covered run or area outside where she can be outside for short periods of time during the day. This may help break her broodiness as well.

Change in feed with mixed grains...what was she eating before? Is the new feed a nutritionally balanced poultry feed like the old one? I see grains and seeds in the photos, but no grit. Do you provide grit? Is her crop emptying overnight?