Is she allergic to milk or is she lactose intolerant? They are two different things, but both include a problem with diary products. It is my understanding that the milk allergy relates to the milk protein not being digested, causing stomach cramps, bloating, etc. Lactose intolerance relates to an inability to digest lactose (the milk sugar). There's no cramping, but loose stools and bloating. I have been lactose intolerant for over 30 years and use a product called "Lactose Intolerance Therapy." It's taken once a day instead at every meal. Since lactose is in so many things, eventhough I avoid dairy products, I take this therapy daily. I also have used soy milk/soy milk products for over 30 years. Two of my daughters were raised on soy milk. They don't cause soft stool. If anything, it would be the opposite. Your daughter maybe dealing with lactose intolerance which would produce soft/loose stool anytime she has dairy. A combination of dairy products over the course of a day or two, would really cause a problem.