Dress up clothes are wonderful at this age. Find a couple of old frilly/princess-y dresses at a consignment store and buy a bunch of costume jewelry, purses, or other accessories. She'll love it!
Also, please check out my Discovery Toys website. We have great toys that grow with children, so she will continue to learn from and play with them for years to come. Playful Patterns is a wonderful toy for a preschool-aged girl (I am giving it to a friend's daughter who turns 3 in a couple of weeks).
View my website and place your order here: http://www.discoverytoyslink.com/karenchao
Please feel free to message me with any questions or for specific recommendations.