Stomach aches and nausea on vacation may be due to many reasons. It may be due to improper diet.
Sudden change in diet schedule etc.
is an pain killer and antiinflammatory drug.
If your child's pain is like cramps she may need a anti-spasmodic drugs like dicyclomine
or buscopan, if it is of burning sensation she may need a pantaprazole etc.
Her pain is not associated with any vomiting
, so probably she would be fine with the pain killer.
Ask her to get plenty of fluids. If the pain is still presistent get her to a physician.