To me, this sounds like heat stress. Let her rest in a cool room and offer her water as often as possible. I think this is all you can do now. One of my birds got trapped under a tub on a VERY hot day and I thought she would die for sure. She couldn't stand or anything. I dunked her in cool water and then brought her inside into a dark room and left her alone with food and water. It took all night but she made a full recovery.