Almost ALL DAUGHTERS have a tummy until they reach puberty and their waist begins to slim down and their hips widen and breasts develop. Then that takes about another year to slim down the tummy after that. That is very normal and they should not be made to feel weird about that.
It would help if I knew her age but if she is under 13 that is very common. Take her to the doctor for a check up if you are worried. She needs a check up at least once a year.