Pediasure probably contains dairy products which aren't good for chickens since they lack enzymes to digest it. Pedialyte, however or Gatorade is a good substitute for electrolytes. She may have just not taken enough water on the hot day, especially if she is low in the pecking order. I like to place at least 3 waterers out in the shade in very hot weather, just in case of the more meek chickens not getting enough.
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