As a reference, my 6", 3 layer birthday cake delivered to California Grill at Disney World was $40. Custom flavor (almond), custom filling (amaretto crunch), buttercream frosting, about half the number of flowers. Disney cakes aren't ALWAYS terribly expensive- I didn't want (or want to pay for) fondant, white chocolate figures, etc.
That's a very pretty cake and I love the cupcakes! Hope she had a great birthday!