You're giving Rice more credit than she deserves.
In the first place, while the Ambassador to the UN is a State Dept employee, they report directly to the President and take no orders from State. Rice is the President's girl.
Second, in her position, Rice had no access to intelligence on Benghazi. She didn't know squat until the President (or Jarrett) told her what to say. True, she might've held a contrary opinion based on the news reports -- but she's too dumb to form one.
"Hack" would be a generous word. "Affirmative action Hack" would be more descriptive.