The 6-Sh66ters have decided to tell Kat about the vote about 10 minutes before voting. They'll tell her that they couldn't tell her earlier because she has the worst poker face. They believe that Kat will agree with that assessment. They will tell Kat that she still has to vote to evict Nicole so that Nick and Bella think that she is part of their team and Kat can act as a mole for the 6-Sh66yters.
Holly wants to tell Jess, too, but Jackson sh66ts that down because they don't need her.
I actually think this could work in their favor. HOWEVER, what if Sam wins HOH next? If he is left out of the loop, he might align with Nick and Bella.