I have to second the http://www.usfirst.org/ recommendation. At age 7, the organization uses regular Legos. At age 9, it switches to Lego NXT. Before you turn your nose up at Legos, remember that the Techics kits have lots of application for building simple machines. The sort of mechanics that your DS will learn in a FLL team will be essential for meaningful explorations of robotics as she grows older.