Also, she may not have seen Joe Schmo 1 but there are lots of other shows out there that try to "trick" people -- like Candid Camera, as she mentions, or Punk'd or the Jamie Kennedy Experience...
So she may not have seen the first version of this show, but I think a lot of people would start to question the 'reality' of a situation when TOO many things seem suspicious.
I personally identify with her, because I think I would be having the same thought processes as her -- and to be honest, I think her figuring it out made the show MORE interesting, because now we get to see more behind-the-scenes panicking!