Really? So you can just delete all the classification labels and send the document to a yahoo account. Look no labels, so it is fine? You better ask your friendly Security Officer about that (actually don't you'll be highly suspicious doing that).
She had 10 or so TS/SCI satellite images in there. Other people would go to jail for that...
She deliberately set up her own separate server, that wasn't an oops I slipped, one doesn't accidentally stumble and end up with a separate email server. Then classified documents up to TS/SCI were found on that server. Imagine an NSA or NRO employee doing that.
"So yeah, Jim, I just set up my own work email server at my house, just send work email there". "Oh, you found some satellite images there? You think you got me, however, see, classification markings are not there so it's fine"