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I think it has a lot to do with extremes. They can handle quite a bit of variation eg. 40degrees at nite - 80 during the day may be "normal". But when it hits 90+ and it's humid, the body has trouble coping.
A dense shady spot that has been wetted down can beneficial. Our spot is prone to random super-hot days (for us on the Pacific coast), and that's how our rabbits succumed. I was at work, and our weather forecast called for it to get up to 75 that day. Well, the weather station is on a buoy out on the bay, so they don't forecast land temps very accurately.
Our chickens did OK that couple days because they have access to tons of shade, dirt for dust baths and getting below the hot top layer of soil, and water (placed in the shade. But to be honest, even the water in the shade was incredibly hot to the touch. I certainly wouldn't drink it to cool off!).
My bunnies were in a pole barn that faces north, yet their water bottles were HOT. SURE LEARNED A LOT FROM THAT ONE. Sorry, bunnies.
If the chickens are to be in a coop and run during the day while you're not there, I would suggest a misting water system.
One story I forgot to mention - I have a neighbor who lost 24 chickens, living in a coop with a dirt yard - on the same hot day that killed my rabbits. The only shade they had was in the coop, where it was HOTTER than outside, so they cooked. Also - they were meat birds, so had extra weight and fat, which doesn't help much in extremely hot conditions.
Is your hen doing better?