CSCin3D wrote:
If there is only one challenge next episode, and being exiled means you're safe from TC (like in Fiji episode 2), and Kathy is exiled, does she get to keep her immunity again?

I would think so, since that would mean she has yet to go to tribal council. You are able to use it at your first tribal council, if she skips tribal this episode, then the next tribal she goes to will be her first.