Hi, K.. Well, recipes for cooked food aside, the best thing to keep a kid regular is fruit, especially fresh fruit. Apples are good for helping keep the digestive system balanced -- not constipated, and not loose. In case of emergency, though, if a child is truly constipated and hurting, a couple of prunes each day is a good remedy and a good prevention.
There are special prunes that have a little extra flavor and are individually wrapped. They are actually as sweet as candy, so if you have a picky eater who doesn't like anything healthy such as fruit or vegetables, if you tell her it's a special candy, and you eat one with her, then she won't know it's healthy and she'll be happy to eat it.
Prune juice is also very effective, especially given at night. It tastes very good, too, naturally sweet without artificial stuff.
In general, if she eats some vegetables and fruits every day, plus drinks enough water, your daughter's digestive system will take care of itself. Remember that here in South Florida, it's very important to drink enough fluids, especially in the summer, and especially pure, clean water.
If you're really worried about bloating, don't give her any soda or other carbonated drinks AT ALL. That may be the whole problem with her belly poking out.
Don't try giving her too much fruit all at once, because then she'll get diarrhea. Just start introducing the fruit and eliminating the soda pop gradually.
I hope this is helpful, and she has no more problems with her digestion.
Peace,
Syl