Nature is the greatest teacher, and you can help facilitate the lesson! Start by helping your child identify a safe place to explore, where she can be monitored as needed, but also where she can feel truly autonomous. Sure, it might make you a little nervous to have her tramping through the outer reaches of the backyard, or a set of unfamiliar forest. But during this time alone, she'll begin to forge a personal relationship with the natural world, that she can carry with her through school and into adulthood.
To encourage this ritual, create a "Back to Nature" backpack together, filled with everything she needs to explore and enjoy the natural world.