It looks to me like Amanda is putting in a second rung, the bottom one. I think perhaps Parvati has one in too, and you can't see it behind her. It looks like Natalie is actually putting her third rung in. You can see the shadow of her first rung (in the second slot) under Amanda's arm. If I'm right, Natalie is winning at this point. Of course, we can't see much of Parvati's ladder and part of Amanda's isn't visible either, so some of their higher rungs could be in as well.

I would guess that Cirie hasn't gotten there yet, as opposed to she has finished. Why would she need to take out the rungs once she stuck them in? Doesn't seem as plausible, so I think she is behind.

Love the cameraman! LOL!