Looks like your daughter is suffering from viral illness. Usually it will resolve on its own in few days. But she should be hydrating herself with good liquids like milk, juices. If she is not taking anything, not passing urine frequently, she is vomiting
everything she is taking, then she needs to be taken to the hospital. She will become even more dehydrated. Just try giving her fluids and if its not possible, call back to the hospital and explain the situation in detail. Don't worry she will be alright.
Dr. Balaji Chinnasami MD
Assistant Professor - Pediatrics