My guesses on the remaining episodes:
13: Lisa out: it's been her good luck that somebody else was always a bit worse, and there are no other weak links left.
14: Barring a major stroke of luck, Antonia out.
finale: Stephanie vs. Richard ... tough call. Seems like Richard has stronger leadership skills, so the more assistants they have, the more likely he'll win.
Though I'd rather eat at Stephanie's restaurant.