I cannot have dairy at all for a medical reason (complete intolerance to the protein, which as you know is not the same as lactose intolerance), and can tell you there are great fakes for almost every dairy product. The no soy part does make it especially tricky though, but there are still plenty of options.
-For cream, try Mimicreme...its made from cashews, comes in sweetened and not sweetened, so you can use it for homemade deserts calling for cream or for cream soups and sauces like alfredo. Really good stuff, and great on cobbler. It's also good to enrich non-dairy milks for breakfast cereals. Use like heavy cream. It's in vacuum sealed paper containers, shelf stable, keeps very well until opened. After opened you have 1 week to use it.
- For cheese, there is a Rice Vegan cheese which used to be made with soy, but recently went soy free according to the package. Really good melted. The cheddar tastes real melted, I'm considering making mac and cheese with it and the unsweetened mimicreme.
-For Ice Cream, there is Rice Dream, which I think is a bit too sweet, but a child likely would be quite pleased. There is a Coconut brand sold at health food stores as well. Its good, but is a bit hard in the freezer so must thaw a bit before serving. I tried coconut milk ice cream sandwiches which were amazing, but didn't check if they were soy free. These products were at Earth Fare, although Whole Foods would likely carry them as well.
-Try the Coconut Milk now for sale with the Almond and Soy Milks. It is really smooth with a bit more richness than Almond.
Try asking the staff at a store like Earth Fare for their recommendations. Lots of foods will be clearly labeled vegan and soy free, and they could tell you what is popular and good. Don't worry, you'll still be able to give her pizza (with cheese) and ice cream, it will just require a little experimentation.