That is not a defense excusing her mistake (if it was a mistake, and not just a lie to cover her negligence). It is a separate set of offenses. State operated with astonishing laxity in handling these communications. She is responsible for that, as the head of the department in question.
The rest of her defenses, well:
“Clinton stated deliberation over a future drone strike did not give her cause for concern regarding classification,” the notes said.One wonders how much Tylenol the FBI agents had to consume during the course of this meeting. Just reading the notes is making my head hurt terribly.
"Clinton stated she believed no policy or practice existed related to communicating around holidays, and it was often necessary to communicate in code or do the best you can considering the email system you were using."
“Clinton could not give an example of how classification of a document was determined."
“Clinton did not recall receiving any emails she thought should not be on an unclassified system."