Thanks for your query.
Your child is having gastroenteritis
which could be due to viral ,bacterial or protozoal infection
Most important is to maintain hydration.
Give oral rehydration solution sip by sip after each loose stool,give coconut water,lemonade.curd,buttermilk,boiled potato,banana.rice porridge so as to maintain hydration and nutrition.
Give lactobaccilus for 2 to 3 days.
Give paracetamol for fever if it is above 100F.
Watch for features of dehydration
like lethargy,decreased urine output,increased thirst.
In case symptoms persist get her evaluated by pediatrician
for further management.
Wishing your child good health.