You could maybe do a small one or two tiered, pink (bc or fondant covered) cake with purses, shoes, sunglasses, dresses, etc. on it?
my daughter liked anything that was pink/black zebra stripes at that age. It would be easy to cover the cake with pink fondant and make black zebra stripes and a tiara on top :)
Not sure how this turned out, but my niece is not too much into the pink girly thing. Her fave colors are blue and green. For her 11th we are doing a Hawaiian cake, three tiers with a water fall, palm trees, flowers and sand. But it sounds like a accessorie cake would be awesome for her.