I dont ever have much to offer, but here are a few things I hpe will help.
In the video (Thanks for helping me find it Kamille) below at approx. 1:15 you will see the silver car begin to make a left turn into the driveway. Look beyond that and you will see DS Jr's truck pulling in from the side street.
http://www.wftv.com/videos/news/team-coverage-developments-in-missing-mom-case/vFMKR/
The unknown woman was waiting for him in the driveway. In my opinion, she was waiting in her car. The woman is on her cell phone, most likely with DS JR as you can see him with his phone to his ear and then removing it at about 1:25
I am not certain what her black bag is, but it looks very much like my black walgreens reusable bag. lol (pause about 1:27 to see it) She doesnt seem very professional to me.
The timing of all of this is weird to me. DS JR and the lady in the silver car arrive at
exactly the same time from different streets. To me it seems maybe they were in contact, possibly via cell phone. Why show up where the camera crew was?
Also the grey/black vehicles in the driveway. (90% sure)
The grey is a Ford Escape
The other darker vehicle is a Ford Explorer (100% sure)
Maybe early 2000's. Notice the trailer hitch.
The blue car with a white stripe is a Ford Mustang (100% sure)