My chicken opens mouth often

[Kurakurakulaku]

So I notice lately my chicken opens her mouth quite often. The weather was about high 90s close to 100s this week. However, it cools down at night to 70s. Do I need to watch out on her or it’s something chicken does normally during hot days?
Do I need to take extra precaution?
Thank you!
(These photos I took at night in the coop. So it shouldn’t be too hot)

 

[rosemarythyme]

Chickens pant when they're too hot, which can be as low as 85F or so.

You may need to consider finding ways to help them cool down when it gets hot, such as providing additional shade and water (I put out shallow pans (clay saucers) of water) or wetting the run floor. Some other ideas: https://www.backyardchickens.com/articles/aarts-extreme-weather-spiel.75893/