I'm sure if she could have wiped your memory of ever seeing her van parked there, she would have (a la Men In Black "Flashy Thing"). I like to use that premise when defending photographic evidence. It's illogical to presume police have the rights over the still images someone can take with a camera as they don't have rights to the mental image and details of an event someone could record and recount later. Maybe a stretch but it wins a lot of arguments, and as a freelance photographer, it comes in to play a lot.
Be well, keep documenting and sharing.