Right now it makes the most sense that she's the original. Not only is she the ''star'' of the show, but an orphan would be a good choice (using TV logic anyway) to use in a cloning experiment.
It would also explain why she likely doesn't
have a monitor; she's not a clone, just a donation of DNA.
If anything, I'd say Mrs. S. might know about the experiment and may have even have been a member of the organization, which is why she fled Europe with her. That's just my personal hunch.