Did she take any outside food?
It can be stomach flu.
A common cause is the Rotavirus.
Next Steps
Add ORS-ORS is a special fluid that can help your child stay hydrated. You can use Pedialyte or the store brand of ORS.
Health Tips
Spoon or syringe feed small amounts. Give 1-2 teaspoons (5-10 mL) every 5 minutes.
After 4 hours without throwing up, double the amount.