Thank you for your query.
She is suffering from a stomach bug.
Give her anti acid medications for a week.
Avoid milk,fruit juice and wheat products for a while.
Give her antacids after meals for 7 days.
Give her some probiotic
Consult your doctor if the problem persists.
If you have any further queries you are free to consult me.
Hope this answers your query.
Wishing a speedy recovery.
Have a nice day.