Can You Help Me Find A Recipe For A Diabetic Birthday Cake And Frosting With Carb Exchanges Listed ?

My 3 yr. old daughter has been recently diagnosed with type 1 diabetes. My stepsons birthday is this weekend and I planned on just getting a recipe for the birthday cake online. There are thousands of recipes, but not many with the carb exchanges listed so that I know how much insulin to give her. Many of the recipes online are for adults. I need a recipe for just a plain white cake. Also I need a recipe for a diabetic frosting as well. Please help if you can!