What if she let them have paper routes?
If it was a 10 mile stomp through a muddy swamp with a backpack full of rocks, then maybe. Good-grief I used to walk all over my neighborhood by myself when I was a child ( younger than 10.) I had to walk to a bus stop that was not in front of my house. My 12 year old and 9 year old like to fight in the car. On occasion I have had enough and pulled the car over to let them walk home ( about 1/4 of a mile.)