I have read up more on it, and you're right, she's not necessarily a comics fan, but more of a facilitator between corporation and creator.
I'm sorry if I overreacted to your comment, it's just that I've seen a number of comments either implying or outright saying that she shouldn't have this job because she's a woman (and therefore supposedly doesn't know what she's doing).
That, combined with your saying that she "seems like a face that can shmooze" made it seem like you were implying something else in that vein, and you can understand why I'd get a little weirded out/offended by that. Sorry for misinterpreting.
That being said, it doesn't seem like her job actually is to be the president of DC Comics, but to be in a better position to use the creative output of DC comics in other media. Which does raise the question of who the highest authority with respect to DC comics is now...Dan Didio? Bob Wayne? Maybe some combined authority between them and Diane Nelson, with Paul Levitz weighing in on things?