Before I start, let me work through who said what. President Obama, the day after the attack, referred to it as an, "act of terror" in an address, and in an interview stated that it didn't "sound like your normal demonstration." Then on Sept. 16, Rice says it was because of a mob. Secretary Clinton stated 2 days after Rice that it was a terrorist attack.
The only person to have said it was not an attack from the start was Rice, therefore I will assume you take issue with this statement.
I'm working off this timeline, FYI.
EDIT: I found an organizational chart of the State Department for you. The information about Benghazi went up the ladder to Clinton, bypassing Rice, and we don't know that it came back down to Rice at all.