I've heard somewher that the French Lady 'Rousseau' maybe one of the others??? Or she use to have strong connections with them! Thinking back to some of the old eps. I cant really see that happening, But after watching ep. 'ENTER 77' there was a couple of incidents that got me thinking..........
First off, she did'nt want anything to do with patchys Crib & tried to scare Locke,Kate & Sayeed by telling them they were not all gonna survive!
Secondly, Near the end of the 77 ep when Sayeed threatened Patchy & told him he did'nt need him for directions because he had found a map, Patchy is just about to say something when Rousseau Puts a gun in his face.
It would also explain how she knows so much about them & why she has never been captured considering there is only one of her & a whole army of the others who are also supposed to be highly skilled at hunting & moving through the forrest without leaving tracks!
I know there's also many reasons pointing towards her not being one but anything can happen in the next Hour!!