She can only be a natural born citizen of one country. If her parents had not attained American Citizenship before she was born, she would not be a natural born citizen of the United States. Period.
Pure nonsense, contradicted by the citizenship clause of the 14th Amendment, the Scotus opinion in Wong Kim Ark and its progeny, Presidents Chester Arthur and Barack Obama, and Vice Presidents Chester Arthur and Kamala Harris. The birther contention that two U.S. citizen parents is a requirement is rooted in nothing but a fervid imagination. A natural born citizen is one who becomes a citizen at birth by the circumstances of said birth. All persons born in the United States, and subject to the jurisdiction thereof, are born citizens of the United States. Persons born outside the United States have their birth citizenship determined by the U.S. Federal citizenship law applicable at the time of birth.
Nimrata Nikki Haley, née Randhawa, was born in South Carolina, was subject to the jurisdiction of the United States, and has been a United States citizen since birth and needed no naturalization.
Many children born of American citizens overseas may be eligible for citizenship in the country where they were born. This does not nullify their United States citizenship or eligibility to be President. John McCain was born in the sovereign territory of Panama. George Romney was born in Mexico. Ted Cruz was born in Canada of one citizen parent.
The population of planet Earth is 8 billion people and they all want to live in the U.S. (with a few exceptions) which is now 350 million people, and that’s only the people they can currently count.
The founders put that clause in the constitution to prevent any person with dual loyalty from becoming President.
Right now, like most of the rest of the Constitution, that clause has no teeth and has been interpreted into meaninglessness.