I was able to finish the entire game on expert levels. However it took awhile.
You must get the highest level cake holder. The one that allows you to store cakes from one level into the next.This allows you to make two complicated cakes a get money effortlessly when the fairies request what you have already made.
However, since you are already on this level another solution is necessary.
You will need the basic cake stand that allows you to display 2 cakes. A soon as the game begins before you take menu orders make your 2 cakes first, then display them, then take the orders. You must time this and use your TV or cookies to calm those faries down because they can get a bit testy. If you can throw an extra couple cakes on display you will gain the amount of money( by making 3 layered cakes or cakes with expensive toppings) and be able to control what the faries order, unless the is the stage where they order the same shape cake if it is then pre make the shapes ,putting one on each froster, do not frost until you get the order. If you do this properly you will have 6 single cakes made before you take the first order.
Don't give up it can be done.