You should remove the water for the first 8 hours to completely rest the stomach. How old is she, because there are some nasty puppy illnesses that start as diarrhea? There is some concern with dehydration if she it tiny, but having no water over the first night should be ok. Would recommend you see the vet to get some fluids into your dog just to be safe. She probably got into something but you may want to deworm her too just to be sure. If the problem persists but is on and off a fecal test may be in order. (your vet probably will do it in-clininc and you will have the results on the same day) Good luck
Kim