While I know the time-line fits, I would think key things like a "hysterectomy" and having a gall bladder removed would be some identifying traits they would release about Sabine.
Plus, while dropping someone off 20 hours away is possible, I don't think it's as realistic.
http://boards.library.trutv.com/showthread.php?t=291654
The police in this Jane Doe case have cross-reference missing persons databases already and nothing has been found.
They are saying that this is likely someone who people don't know is even missing.