The way I understand it, the case for a prosecution on those statutes rests on intent. Other similar cases have been prosecuted on the basis of intent, and have usually included charges for attempting to deceive investigators. In this case there was judged to be no intent, and no leaking or private use of the material at issue.
Whether she got the benefit of the doubt because of her stature and political possibilities is an open question, albeit one that's quite hard to prove either way. But I would assume any political considerations in her favor would be counterbalanced by the fact that DoJ officials would be quite aware that Congressional Rs in oversight positions would be quite anxious to check their work.
So even in the draft memo states that they didn't think it was possible to prove intent, ergo no prosecutable case.
I sincerely doubt that anyone, from HRC camp or the DoJ, is going to go down for this.
But, yannow, kudos to Hannity and company for making sure this pressing issue doesn't get swept under the rug. It's not like the actual current President is under investigation or anything.