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I would try adding some fiber to her diet to see if that helps normalize her GI motility. An easy way to do that, is to give 1-2 teaspoons of canned pumpkin or sweet potato baby food 2-3 times daily. If this is more of a chronic issue, then I would have your vet see her. In that case, we like to do bloodwork and a fecal exam to look for infectious causes, parasites or metabolic causes. Treatment is often times with a round of Metronidazole (antibiotic) and often times a general dewormer in case of parasites.
I hope this helps, let me know if you have any other questions.