What does this poo mean?
She may be drinking a large amount of water to keep hydrated during hot weather, and that can cause watery stools. Gather some fresh droppings, and you can have your vet to run a fecal float to look for worms, cocci, or bacteria. Valbazen 1/2 ml orally to each chicken and repeated in 10 days is an excellent dewormer. Using a probiotic or a small amount of plain yogurt or buttermilk a couple of times a week can be good for the GI tract.