I didn't read the other threads buuuut
I suffered from heat stroke on vacation in Costa Rica back when I was 21ish? At least 5 years ago. I got heat stroke, we were on a trail hiking. My boyfriend (hubby now) left me to trek up the mountain with his 1/2 sister's mom. My vision went blurry and I lost my hearing, and I had to lay down due to dizziness. A local went and dumped my shirt in the ocean, wrung it out and brought it back to me, forcing me to wear it. It was cold, and I felt freezing. She probably saved my life that wonderful lady. I didn't go to a doctor for treatment, being in a foreign country and all. Stayed in an airconditioned hotel room for 3 days and slept the entire time. I felt I had the flu. Freezing cold all the time, my skin blistered and peeled. I somehow forgot how much closer I was to the sun than in WI. (DUH!)
Now, I can go out and garden and hang out in the sun for a few hours, but I usually have a dizzy spell after an hour or so. Anything too much and I get really nauseated, really ditzy, stumbling...I look like I'm drunk. I don't make sense. Hubby always knows when I've been out in the sun too long. Almost daily I get very dizzy being in the sun to almost fainting, but never quiet do it.
I wouldn't be surprised if this is something your daughter deals with for the rest of her life. I have been for at least 5 years. I don't even live anywhere super hot!
ETA: more symptoms of my heat stroke.