Just gonna point this out. If what the FBI says is true, and that the following was true:
She either did one of two things, maybe both.
1. She wasn't reading what she was sending, because if an email had markings on it she would know it was classified.
2. She knew and sent it anyways.
I am not sure which one I think would be worse.
I am not going to pretend I have ever been the Secretary of State, nor have I ever held a position where my input is required on so many issues at once. I get it, Secretary of State is a hard job. You have to keep track of every little issue that comes up. Things get hectic, corners are cut.
But the systems in place are there so that they can track those things, who got it and when, and whether they need to be debriefed. Odds are the people that she emailed were cleared to see the emails anyways. And for all intents and purposes, the government has been over classifying information forever. That doesn't mean that you get to just do what you want because of who you are.
In the grand scheme of things, do I think what she did was horrible? Honestly, not really. She had a job to do, and she believed this is how she needed to do it. She would have been burned at the stake had she followed all the rules, and say a US Embassy was attacked, but she couldn't get the information because she didn't respond to an email within the time limit the Republican ever changing expectations of what a Secretary of State should be expected to respond. This is a last gasp at trying to help someone they don't like, beat someone they hate to become POTUS.
But she is by no means dumb. She knew what she was doing, and did it anyways.