They're playing some mild dominance games, but nothing major yet. She's very well behaved in the car; she sits and /stays/ when told; she enjoys being a lap dog.
I'm reasonably confident they'll figure out a dynamic that works for them and all will be well.
Meanwhile, it's probably a good thing that I don't have to work outside the house again until Thursday, so they can have plenty of time in the house together.
We /are/ going to need to fix the back fence and gate before we can let her out there unleashed, I think, but she does well enough in the front. Oh, and she enjoys playing fetch.