Thanks for your query.
your daughter can have some stomach infection
which can be viral or bacterial in nature.
Monitor her temperature 6 hourly and if it is more than 100F give acetaminophen
Give some anti emetic if vomiting
Maintain her hydration and nutrition by giving fluids,coconut water,curd,rice porridge.
In case symptoms persist get her examined by pediatrician
for further management.
Wishing your child good health.