try using the florastor packets. You add 1 pack 2 times a day to applesauce or juice to add the good bacteria back to their tummies. I also give my kids the activia yogurt everyday to maintain good tummy health. Roto virus can get pretty serious (and thats what it sounds like she has). In the mean time buy stock in huggies. Diarrhea is no fun for sure, for you or her. Continue with the brat diet until the symptoms have subsided, and get a good diaper rash cream. I recommend calmoseptine. Good Luck!