Thanks, Steadfast. I think you're going to save my sanity on this. Are we sure that white door-looking thing on the opposite end isn't the door? My eyesight isn't so good, and it's too small/unclear to me to tell for sure. See, all this time, because of very early discussions, I thought that white thing was the door. And driving back to that door raised the risk of being seen too much (for me).
I'm going to poke around some more in old threads today, or if anyone can confirm the white thingie is not the door and the portico is, it would be great, because I really think that would be our answer - not of how it actually happened necessarily, but a way it definitely could have. That is, both adult and child exit the portico door, w/the adult having driven the vehicle just slightly back to that door and paused quickly while the child climbs in. Ruses that children fall for easily take care of everything else for me.
Thanks so much, Steadfast.