Who adopted her. She was supposedly born in Indonesia and her father was Lolo Soetero and always has been. There is no evidence that she was ever adopted in Hawaii.
Now maybe she was born in Hawaii (not adopted) because a record of some sort, Not COLB shows her being born in 1971 while other claims are she was born in 1970. It is all very strange.
I have no idea how she got one either but that is the only logical choice if we are to believe what we are told about where she was born.