I agree. I think it's the editing. They keep showing the other players, saying they suspect Dorthy. Plus, they showed her pulling 2 answers out of the air in the puzzle challenge.
My take on the puzzle challenge. She knew the answers but was afraid of being wrong and looking like a fool in front of the others.
And if you are truely playing the game; wouldn't you want others to think you were the mole, so they would answer their quiz questions wrong. At least how I would play it.