If you cannot run over it, safely, which you can't, I would throw it away. My grandson is learning it is a safety issue that he pick up after himself in the yard precisely because of the danger from running over something and having it fly out and hit someone, etc. My mom and dad both taught us to pick up after ourselves as we went about our work, esp. when cooking in the kitchen and, in dad's case, when welding and other outside work.

IF you want to preserve your life, impound them and/or find some kind of portable, on wheels?, catch-all, she can keep handy for tossing the stuff in, but she HAS to keep it picked up! How the heck does she find it when she needs it next?

Good luck!