Just to settle the question of whether Cirie knew about Amanda's idol (if it hasn't already been settled in some other thread):

Posted on 05/13/2008 in Cast Interviews, Survivor Micronesia

http://www.realitywanted.com/newsitem/1111-interview-wih-natalie-cirie-and-amanda-from-survivor-16-fans-vs-favorites

Q: Did you know that Amanda had the immunity idol and was planning on using it?

A: (Cirie) I did. (Amanda) I told her.