Card games can be fun with just 2 people, gin rummy, slap jack, crazy 8s or teach her a favorite solitaire game.
Take pictures from previous trips and make photo albums she can take home with her. It can be as simple as gluing pictures on Construnction and adding words and stickers, or as complicated as you want.
That is the age I got my oldest hooked on Nancy Drew books she still loves them and all books my youngest on the other hand never did get a love for reading I tried it just never took.
Gather sticks and make an outline of a hopscotch game and play hopscotch. Take jump ropes and make up games and rhymes while jumping. She can jump you can make up the rhymes.
Do you have bocce balls? You can usually get an enexpensive set at places like Walmart or target.
Take scrap fabric and Construnction paper glue a quilt together or make a wall hanging with them and the natural elements in your campground.