“What part of “American parents” aren’t you getting?”
It does not appear that she can provide documentation of a legal adoption.
Perhaps it was an Undocumented adoption.
So you’d rather think BOTH the Korean government AND USCIS missed a kidnapping, but the SSA, famous investigative agency that they are (also notorious for denying early benefits on arbitrary pretexts, thus starting an entire legal industry for Americans to obtain benefits they’re due by law), caught this skullduggery?
Furthermore, what sixty year old documentation can YOU lay your hands on without going into the records of the governing agency?