Thank you for the information,
The symptoms can be due to viral
infection which usually resolve by itself with supportive therapy.
Viral infection usually gets better in 3-5 days.
But sometimes, bacterial super infection can occur during post viral period.
In that case, start of antibiotic will reduce the symptoms.
Nausea, diarrhea and abdominal cramps can be related to stomach causes like indigestion or a viral infection.
You can take pepto bismol which can help in abdominal cramps,diarrhea and nausea.
Dramamine can help in nausea.
Keep adequate hydration by plenty of fluid & electrolyte solutions like gatorade if you can tolerate.
If the vomiting and cramps are so intense, and if it is difficult to maintain her hydration, you may need intravenous fluid.
If the symptoms persist, then it is advisable to check with ER.
Please feel free for any follow up query.