At the end of the movie "Another Earth", Rhoda encounters herself in front of her house's garage. It's very obvious that almost the same events did occur on Earth 2 and her mirror did travel to Earth 1 which both suggests that the synchronicity didn't break 4 years ago when Earth 2 was discovered but it also suggests that the synchronicity is broken because Rhoda from Earth 1 didn't travel to Earth 2.
How should we interpret it?