I was also going to suggest the same thing as Sarah. When dh and I first quit drinking cow's milk, I would use about 1/4 soy and the rest regular. I doubt your dd would even notice that she was drinking soy milk. Over time I used more and more soy, and now I really *don't* like cow's milk. It tastes sour to me now. I like Silk and Vitasoy the best. Certain brands taste better than others.
Good luck to you!