@Thomas,
You would be correct, Thomas, in that the officer in charge of the Dept of State can lawfully do wtf they please if the US were a dictatorship. Since she hasn't yet assumed that role, she is not above the law.
That being the case, the law she broke follows: unauthorized removal and retention of classified documents or materials. Of course, knowing our crafty heroine, that's probably the tip of the iceberg.
Here's the statute: Whoever, being an officer, employee, contractor, or consultant of the United States, and, by virtue of his office, employment, position, or contract, becomes possessed of documents or materials containing classified information of the United States, knowingly removes such documents or materials without authority and with the intent to retain such documents or materials at an unauthorized location shall be guilty of this offense.
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This is a very bad girl who does not look good in orange.