Why do you believe any of that resided in her emails? It seems people have went to town with their own speculations of what happened.
Here are some facts for you directly from Comey:
But "a lot of what ended up on Secretary Clinton's server ... had been forwarded up the chain ... and then she comment[ed] sometimes on it," Comey told the House committee.
"In most circumstances, it initiated with aides starting the conversation," he said. Only one conversation — consisting of several email chains — involved top-secret information, and "Secretary Clinton not only received but sent e-mails talking about the [top secret] subject."
...
In fact, he said, three emails on Clinton's server had a paragraph "summariz[ing] something" and included a C in parentheses at the beginning of it, indicating the paragraph contained information "classified at the confidential level, which is the lowest level of classification."
But those paragraphs were "down in the body" of the emails, and "none of the emails had headers at the top of the document that said it's classified," Comey said. Because of the improper absence of such headers, it "would be ... reasonable" for Clinton to think the emails did not contain classified information, or she may have missed the C markings buried in the tens of thousands of other emails exchanged, he acknowledged.
Even if she did notice the markings, "I think it's possible — possible — that she didn't understand what a C meant when she saw it in the body of the e-mail like that," he said