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I suspect three things, it is just assumption based on history.
1. Stomach ulcer, as she had pain after food and water.
2. Worm infection, need to have a look after food.
3. If non of the above, must be ruled out by investigations.
Then it is called functional abdominal pain. I advise you to visit a specialist. She might require one-week antibiotics and if symptoms not settled, then endoscopy also. But the best part is to visit the pediatrician. So he can evaluate her in detail and examine her.
Meanwhile, you can give symptomatic treatment. Kindly consult your doctor to discuss the suggestion and take the treatment with consent.
- Pre or probiotics.
- ORS (oral rehydration solution).