Symptoms related to any diarrheal illness are often associated with any infection to the gastrointestinal tract, such as high grade fever, loose motion and abdominal pain. Electral or ORS (oral rehydration solution) needs to be given as the mainstay of treatment. If the amount of ORS taken in is greater than the amount lost, dehydration will not occur. It would help in replenishing the lost salts and water. She should be well hydrated with electrolytes, along with symptomatic treatment like NSAID (acetaminophen) for fever, anti secretary drug like racecodotril to reduce the frequency of motion and also to prevent dehydration will help her. Continue Zintac and the other medicines. Give some antiemetic like ondansetron 30 mins before food. It will help in retention of the food and prevent vomiting. Any food except for milk, can be given. Curd or yogurt can however be given. No specifications about food that will stay. Just use the antiemetic and things would be fine.