DNA testing...
Somebody help me out, since I missed the first 15 minutes and may have missed something crucial...
How precisely did the girl's real parents (the redheads) know she was their daughter without any DNA testing? I mean, maybe I watch too much SVU or something but shouldn't that be the first step? Or, if they had the birth certificate, why didn't they simply match up fingerprints? Or do fingerprints have a tendency to change in 13 years? ;}
Because she has red hair, lives nearby, and has mysterious origins and a strong suspicion, they just take it as read (red? red hair? get it?) that she's their daughter? Perhaps they clipped out a scene for TV, but I can't recall a single scene that offered any conclusive proof that she was truly their daughter! While they're getting on her for not being a good sport and embracing her new (old?) family, they may have had the wrong girl all along! Who came up with this plot? A fifth-grader?
All right, end of harangue.