Aber ist sie damit nicht automatisch eine US-Staatsangehörige, wenn ihr Vater diese Staatsangehörigkeit bei Geburt besass. :
"Automatisch" ist man nur US-Staatsangehöriger, wenn man auf dem Territorium der USA (einschließlich Puerto Rico, Panama-Kanalzone, US Virgin Islands, Guam und Nord-Marianen) geboren wurde, und die Eltern keine in die USA entsandten Diplomaten oder Regierungsvertreter fremder Staaten waren.
Children born overseas to married parents
The following conditions affect children born outside the U.S. and its outlying possessions to married parents (special conditions affect children born out of wedlock: see below):
If both parents are U.S. citizens, the child is a citizen if either of the parents has had residency in the U.S. prior to the child's birth
If one parent is a U.S. citizen and the other parent is a U.S. national, the child is a citizen, if the U.S. citizen parent has lived in the U.S. for a continuous period of at least one year prior to the child's birth
If one parent is a U.S. citizen and the other parent is not a U.S. citizen or national, the child is a citizen if
the U.S. citizen parent has been "physically present" in the U.S. before the child's birth for a total period of at least five years, and at least two of those five years were after the U.S. citizen parent's fourteenth birthday.
the U.S. citizen parent has not been "physically present" for a total period of at least five years, then a U.S. citizen grandparent must have been "physically present" for at least five years.
Children born overseas to unmarried parents
There is an asymmetry in the way citizenship status of children born overseas to unmarried parents, only one of whom is a U.S. citizen, is handled.
Title 8 U.S.C. § 1409 paragraph (c) provides that children born abroad after December 24, 1952, to unmarried American mothers are U.S. citizens, as long as the mother has lived in the U.S. for a continuous period of at least one year at any time prior to the birth.
8 U.S.C. § 1409 paragraph (a) provides that children born to American fathers unmarried to the children's non-American mothers are considered U.S. citizens only if the father meets the "physical presence" conditions described above, and the father takes several actions:
Unless deceased, has agreed to provide financial support while the child is under the age of 18 years
Establish paternity by clear and convincing evidence and, while the person is under the age of 18 years
the person is legitimated under the law of the person's residence or domicile,
the father acknowledges paternity of the person in writing under oath, or
the paternity of the person is established by adjudication of a competent court.
8 U.S.C. § 1409 paragraph (a) provides that acknowledgment of paternity can be shown by acknowledging paternity under oath and in writing; having the issue adjudicated by a court; or having the child otherwise "legitimated" by law.
Das wäre dann zu prüfen, aber wie schon geschrieben: am besten hilft da das US-Konsolat.