You might want to check her crop to see if it is empty, partly full, hard, or puffy. Try to get her to drink some fluids, eat a little chopped egg, and some watery feed in a bowl. If the feed was not coming out of the feeder, it's possible that she is weak from that or the heat. But many other problems can occur. When I have a bird acting that way, besides checking the crop, I pick them up to feel for any weight loss in the breast bone area, look at the vent for signs of diarrhea, lice, or mites, and try to get them eating and drinking. Electrolytes and vitamins for chickens added to the water may help. With birds 2 and older, they can sometimes suffer from internal laying or egg yolk peritonitis. This, or a digestive problem, or intestinal infection such as coccidiosis can make them weak.