J.G.
Hi. So my son, who is now 17 months old had a similar problems in jan/feb. He had a stomach virus then and it seemed the diarrhea never really totally went away. Then we tried transitioning him to whole milk and it came back full force. I took him to the doctor and he had said that some children become temporarily lactose intolerant after a bout of the stomach virus. I confirmed this with my sons GI doc too. It's because from all the vomiting and diarrhea, the part of the stomach that secretes the lactase enzyme is sloughed off. Unfortuneately in my sons case he remained lactose intolerant and is also gluten intolerant (and a picky eater)! But I would try her on either soy or rice milk (soy is cheaper) for a little while and see if she improves. Good luck and let me know if you have any questions and I am unfortuneately knowledgeable on the subject.