What to get a smart 10 year old girl?

Consider getting her a STEM-related kit, such as a robotics or coding set, which can engage her intellect and creativity. A well-reviewed book series, like "Percy Jackson" or "Harry Potter," can spark her imagination while also fostering a love for reading. Additionally, art supplies or a subscription to a science magazine can encourage her exploration of different interests. If she's into puzzles, a challenging jigsaw puzzle or brain teasers could also be a great fit.