Tiffany was born to Marla, not Ivana.
Two citizen parents makes her a natural born citizen, sadly the others are not.
Foreign national parents bring foreign citizenship(s).
It is an exclusionary term, that is why they used it.
Solely an American, no other possibility.
Tiffany was born to Marla, not Ivana.
Which is why she is the only one eligible, because she is the only one both of whose parents were U.S. citizens at the time of her birth—which is the point Lurkinanloomin was making.