She sounds like the way my Buff Orpingtons acted when we had 100+ heat this summer. Here is what I did for my chickens.
Made wet spots, that they used to dust bathe, they did that more in heat. They also scratched these spots down to make themselves cool holes.
Set out a shallow pan, was a new oil change pan with cover removed never used for motor oil. I picked this because the plastic was a lot heavier to take chicken abuse. Filled it with water so they could cool feet and a couple liked to squat in it to cool bellies.
Froze gallon plastic jugs and placed them where they could lay next to them.
Went out and sprayed around coop and run to cool the ground around them, some played in the spray others ran from the water. Had a spray gun that leaked no matter how much I tightened it. I put that over a part of run so the leak would wet the ground under it, making a cool puddle. They would scratch area and lounge near puddle to keep cool.
Changed drinking water a couple times or more a day, they liked the cold water and would gather to drink.
I live in high desert area, so hydration is important when it is very hot. I added electrolytes and vitamins to one waterer and probiotics to another. They would not eat much in heat but the couple hours before sunset they pigged out. That was the time of day I would give them fresh cut greens, or stuff from garden.
Good luck with your chickens!