There are no such flavors that you child shouldn’t have except for the ones that can cause allergy. You can choose any flavor she likes. Theme cakes, if bought from bakers, can be really expensive but you can make one yourself at home as well. Browse some good sites for recipes and directions. Since your child is too young to understand the significance of this celebration, don’t spend too much money on buying a themed cake. Rather, keep it for her second or third birthday.
If you are baking your cake at home, here are some instructions for giving it a professional look.