OK. She's responsible for checking to see if material she is sending is classified. The state department routinely marks classified material in the headers. The e-mail in questions didn't contain the classified markings. Let's see how the FBI Director assessed the situation:
Asked whether there was a header that contained the “c” in the text, Comey said the “c” denoting classified material “was in the body in the text but there was no header on the email or in the text.”
“So if Secretary Clinton really were an expert at what's classified and what’s not classified and we're following the manual, the absence of a header would tell her immediately that those three documents were not classified,” Rep. Matt Cartwright (D-Pa.) remarked. “Am I correct in that?”
Comey called it a “reasonable inference.”
Ok I will agree she's dumb and unreasonable...LOL