Because she always talks about disliking houseguests behind their backs, but never is upfront about it to their faces. AKA fakenesss.
What they don't understand is that being nice/real doesn't get you far in the game, and that burning
bridges that don't need to be burned only hurts your game and never helps it.
Joey(the first evictee) is a prime example of this.
BBCAN is on TV right now and Jon is reading his letter from his now ex janelle saying how amazing he is. Right when the show ended he dumped her for Neda