Consider getting her a kids' cookbook and the "stuff" to go with it- apron, small mixing bowls, her own measuring cups. Math can be really boring, but baking and cooking are really all about math and equations. Take a recipe for two and "double it"... what do you have?? Addition, multiplication, measurement and sequence/direction-following, maybe even some telling-time and elapsed time.
Educational toys are pricey and have always felt "packaged" to me. I used to suggest that parents look at more practical items that allow for growth and interaction. She can get in the kitchen with you, do something fun and then get to eat something delicious as a reward for all of her efforts!