Good points, I didn't think about the fact that GP might have been there alone. That make sense, with no windows and a roof top fan it would be unbearably hot in a Wyoming sun. The door would have to be cracked to be comfortable at all. It would be typical to close the door when people passed. I assume the sandals where hers. She appeared to be trying to keep things clean and organized (I assume for personal preferences and the desire to be able to use images of the van insides). The sandals were left outside - typical of person keeping the interior clean.