Ok, try this: If she didn't use government email, that classified material was sent TO her - by others. (Unless she typed it in by hand?) She was the RECIPIENT.
If someone emails YOU classified material, is it automatically your fault?
They actually already do "postal zone dumps" in the United States, in that the front of every single piece of mail sent through the Post Office is imaged and put in a database for law enforcement. They've been doing it for some time.
I had no idea this was being done.
The answer to the question of Life, the Universe, and Everything is... Four day work week, Two ply toilet paper!