Tell us something about her. What breed, how old, color, etc. Also need to know how hot it was and perhaps you know how long she was exposed. I would get a bucket or air temp water maybe a little cooler and submerge her (-) her head in the water to soak her. This will bring her temp down and keep her out of the sun. Once one is a heat casualty, you are always more susceptible to it in the future and it will progress to heat stroke thus death. She seems to be a pet and perhaps older. I'd submerge her for sure and the moisture will keep her cool for awhile. Most birds operation temperature is 100+ degrees (perhaps more like 106), so its gotta get pretty hot. Meat birds will not tolerate that heat though and I ASSume she's not a cornish, nor freedom ranger like bird. They'll die quickly in heat, at least the cornish will. Sure their core is 106, but don't contribute to that. The normal chicken gives off indicators like walking around in the shade with their wings away from their bodies etc. Provide a cool environment to avoid these situations. Good luck.