Hi, thanks for using healthcare magic The most important part of treating gastroenteritis is preventing and treating diarrhoea by administering enough fluids. Children can easily become dehydrated. This would present with dizziness, excess drowsiness, increased heart rate, decreased urination, dry crying, dry skin. Since she has been experiencing persistent watery diarrhoea and fever (also causes fluid loss) for 2 days then she may need to be seen by her doctor to make sure she is still hydrated. She needs small amounts of fluid to be given consistently. The amount can go up if she tolerates it. The best fluid would be the oral rehydration fluids because these would give her fluid and electrolytes. In terms of the fever the paracetamol or the ibuprofen should help. It may be the dose that is not enough to help. I hope this helps