I'm pretty sure there was a lack of evidence that the DA found. I'm not saying nothing happened but RezLife at ND, which is notorious for being hardass, and the DA didn't find enough evidence to prosecute. I'm not saying nothing happened - we don't know.
The article is very one-sided. I would think a ND graduate would look at both sides, or at least acknowledge that official investigations ran aground, and no, the text from a buddy is not the same as an official cover-up. This isn't like Penn State. Unfortunately, this seems like a woman who wants a high five from her friends in DC from fighting corruption, when this sort of thing, while sad, goes on at most BCS schools, including the University of Alabama.
In short, she ignores all the good stories on the team except for her begrudging acknowledgement of Manti Te'o. If there's any evidence of administrative malfeasance, she should find it. This column proves nothing.