Any specific questions/needs? We were there several weeks ago (our two are 11 and 13, and one had a stress fracture of her foot, so we were on a somewhat altered plan).
Really, the whole place is a playground for nature/science lovers. Most of the visitor centers are well-done and have helpful and interesting exhibits. We had planned on more hikes, but the park is very accessible so even with the huge boot on DDs foot we were able to visit just about everything we wanted; some hikes we curtailed, or DH doubled back and picked us up to lessen the walking for her. There are junior ranger programs, I think they may be aimed at a slightly older age but I would think your DD would enjoy them (our kids are no longer interested😔). You can sign up for ranger-led activities daily, from most visitor centers (when you enter the park, you get a map and list of things going on). I would consider purchasing a driving tour (depending on your plans)- we used an app with park rangers describing geology and history but it was glitchy; there were other programs for sale once in the park, some based on GPS landmarks, which sounded good. We bought and pre-read several basic guide books, all had sections on geology and wildlife, some on Native Americans of the area, etc. Each visitor center we went in had a nice selection of books and guides; I think there was a kid's book section in each and most had guides to various disciplines, as well as workbook-type books if you are into those.
Have a great time- we loved it and are hoping to visit sometime in the winter. The exposure to geology and geologic processes is absolutely marvelous, and the wildlife viewing was spectacular.
