Both times Sara has been in the show has been last minute, the first time Caissie Levy was already in the role and was gearing up for it but dropped out last second to take Frozen, causing Sara to go in super fast.
The second time, Ana kendrick was supposed to take over but with press with a simple favor and her new Hilton hotel deal she had to drop it. So again, Sara had to save the show.
Now the next jenna also dropped, so i wouldnt be suprised it we see Nicolette extend through the holidays with sara closing the show.
At least thats what my source has told me