Thanks for your query.
Your daughter is having acute gastroenteritis
which is mostly viral in nature and settles in few days.
Most important is to maintain and monitor hydration status.
Give oral rehydration solution sip by sip after each loose stool
,give coconut water,lemonade,curd,boiled potato,banana.rice porridge.
Give lactobaccilus for 2 to 3 days.
Monitor for features of dehydration
like decreased urine output./lethargy and in case symptoms persist get him evaluated by pediatrician
for further management.
Wishing your child good health.