Marquesas F5 Question

Why exactly did Kathy side with Paschal and Neleh instead of Sean and Vee? She knew those two would never turn on eachother and it'd be suicidal to go to f3 with them. Sean and Vee, while a tight pair, wouldn't be blindly loyal to one another. Not to mention the Rotu dominated jury would give the win to Kathy over either of them.