Thank you for your query,
Your child seems to have a Viral Gastroenteritis
Oral rehydration solutions like Pedialyte, coconut water to be give sip by sip in equal amounts of the losses in loose stool
and vomiting to prevent dehydration
For vomitings to control, give an antiemetic like ondanstron in prescribed dosage.
Monitor her hydration status, urine output and skin turgor.
Consult your Pediatrician
for examination and management.
Hope I have answered your query.