Hello, it is important to maintain fluid intake to keep up with her fluid losses in the stool. Dairy products can be more difficult to digest during a diarrheal illness. Soy milk can be substituted if there is no history of reactions to soy products. In addition, yogurt contains active cultures which can help the gut to heal. Pedialyte for her age is an electrolyte solution sold in stores and is useful to have for self limited diarrheal illnesses. Please follow up with your doctor if the illness or fevers worsen and also if she can not maintain good hydration.