I also noticed that the moon roof was open but perhaps that happened when they hooked it up to pull it out.
Here's my thinking:
1. There have been no comments from family, friends, neighbors and co-workers.
2. There has been no press other than short factual reports.
3. There has been very little commentary from LE.
4. I think (need to go back and check) that the car was spotted by a LE helicopter - did they have reason to believe she might be in the water?
Sadly, the above leads me to wonder if we have a case of attempted suicide. If it were a crime, we'd be hearing some concern and alarm. If she took off, we might be hearing pleas from family members to stay safe and come home when ready. When there's an indication of suicide, I feel like the natural reaction of all involved is to clam up (unfortunately this might perpetuate the tendency to hide mental illness, but that's a story for another day).
While it might sound unlikely, I wonder if she changed her mind when the car went under water. The frigid water would probably prompt most people to escape regardless of their intentions. Maybe she floated up through the moon roof (intentionally or otherwise) but never made it to shore. I don't know how strong the currents are in January so she could be hard to find. And it's 27 degrees in the greater Lowell area today so I'm not sure if many people will be out looking today.
I hope I'm wrong.