First, congrats Nat!!! She's definitely the most worthy winner out of the final 3!
Anyway, there's something happened in the live show that I thought accidentally revealed that Jaclyn was in the final 3. When Jeff explained about the amount of food the castaways had and then he approached one of the audience, which was the little girl, you can clearly see on the backrest of the seat there's a paper written "The Seat Reserved for Jaclyn Schultz Friends and Families" (when he explained that, Baylor even hadn't voted out yet).
What made me thought that she's on the final 3 directly back then was: why should the production placed her families on the front row if Jaclyn wasn't in the final 3 anyway?
Note: It's my speculation but maybe that's why someone tweeted Jeff not to go to the audience...
Here's the picture of it (click to enlarge):