I am hoping that Nat will be messing with Kevin's head on Thurs, and will actually vote to keep Jeff. Then, she has Jeff and Michelle both going after Kevin and doesn't have to get her hands dirty again. Jeff or Michelle win HOH, and the other win POV. Kevin going to the Jury House doesn't hurt her either, as he has no sway with anyone, not even Lydia who will do what Jessie wants.
Then, she takes her best (as she says she has been saving it all summer) shot at final HOH. I think both Jeff and Michelle would take each other, as they both know Gnat has more probable Jury Votes, and between them, it's a toss up.