Thank you for your query.
There is little reason to worry.The likely diagnosis is viral gastritis
.This is quite common in children of this age.Avoid milk,fruits,fruit juices and wheat products till she recovers.Give her a mild antispasmodic along with a mouth dissolvable lansoprazole
tab before breakfast for 10 days. Give her small frequent feeds at regular intervals.If she vomits give her a mild antiemetic.
Hope this answers your query.Wishing her a speedy recovery.Bye