First, don't feel that you need to entertain her all the time. She needs to be able to spend time doing what she wants to do. Make sure she takes some books,or a Kindle. My Kindle will hold a charge for about two weeks if I turn off the WiFi and can be charged using a car charger. There are lots of free books out there so you can load it up before leaving home. Take some board games. Take a pack or two of playing cards. Teach her to crochet or knit, if she is interested. You two could learn together. Get one of those looms that you can make pot holders on. Get a book on rocks and minerals and collect rocks while you are camping and hiking. Get a books to identify birds, flowers, and/or trees. Learn to read a map and compass as you are hiking.