"You walk outside, you risk your life. You take a drink of water, you risk your life. Nowadays you breath and you risk your life. You don’t have a choice. The only thing you can choose is what you’re risking it for."
My theory is that Judith is intact alive and safe. I think Lizzie and the other kids took her and are hiding somewhere (hopefully safe) and they just left her carseat because it was easier to carry her without it.