I think she would put up Andy bc of the exterminators, she would think they would be pressured to vote out Elissa if she was on the block. Also she knows how close Andy is with them, hence why Elissa put him up with Aaryn and she told GM she did all that work to further "their" game and this is how they repay her, keeping Andy over her bc he was with them longer. Andy would have spencer and Judd's vote to stay bc of their alliance.