That is really the saddest thing to me. I remember with great amounts of happiness when I was between 5 and 10 years old and would ride my bicycle around the neighborhood with my friends, go traipsing around the woods, and exercise my imagination. (Getting home and having to sit still while my mother dug through my hair and scalp for ticks was torture, but was worth it.)

My nephew is not yet four years old, so he's probably still too young to be outside playing on his own, but I fear he'll be in the same boat as your daughter in a few years, unable to do anything outside of his parents' line of sight.