This is why I keep gatorade and pedialyte around - because this kind of thing happens, but sometimes I don't unfortunately. More often I try to because of accidents.
Try to get electrolytes in her via beak dribbling. Gatorade will definitely do the job. When we evacuated and had to take my parrots in the car, they all got horribly overheated (the great horrible hurricane evacuation in the news from Houston a few years ago). I had fruit and gatorade. As soon as we were forced back home, they all got gatorade. I only lost one, and trust me - they were bad enough to lose them all.
Remember that heat problems don't just manifest the first day. If she's had organ problems, it'll continue for a couple of days. So give her the electrolytes for a few days.
As for orange juice - it's ok, but in moderation. Better to give pieces of fresh orange. It actually can help slightly acidify their gut. You don't give just the juice or lots of oranges because of acidity - it's just too much.
Try a little karo syrup in water, or a tiny bit of organic apple cider vinegar (organic only) if you have some. (1 teaspoon per half gallon). It has some electrolytes in it, tho not enough.
Hope this helps.
By the way, next time just wet her combes, wattles, rather than cooling her entirely. Poor baby