Amanda's main problem is that her game plan is to be the main accomplice or sidekick to another player who makes the bold moves. For someone to win with that strategy, either that person is up against their main ally who is hated by the jury (Amber/Rob) or that person is up against another player who is viewed as a weak coat tail rider (Ethan/Kim). In both of her seasons, Amanda assumed the role of accomplice/sidekick to Todd/Parvati. Since Todd and Parvati both could own up to their bold moves and neither was hated by most of the jury, Amanda had no chance to win against them.