Pretty in Purple

Carly, my granddaughter, is 11 and she always has a definite design in mind when it comes to her birthday cake. She called and said, "Grandma, you got a pencil and piece of paper? I'm gonna tell you how I want my cake to look."I got a pencil and paper, this is how it went down. For the bottom layer I want light purple icing with zebra stripes. For the second layer I want white icing with light