As a major book lover and lover of the outdoors, my opinion is to encourage physical activities to complement her indoor adventures. A couple picture books about her local animals, birds & bugs along with a little pair if binoculars would serve her passion for reading and help expand her horizons.

When one of my nieces turned 4, she begged for a microscope. My sister got her a kid friendly real one with plastic slides and everything. She's 9 now and still uses it for exploring everything from her painted fingernail clippings to her dinner crumbs, and to bugs & rocks.