Tell your friend that she's a racist.
Why? Because every birther is a racist.
I know that's a strong statement, but I can prove it. Every birther believes that Barack Obama is not the legitimately elected president of the United States because there is some question as to whether or not he was born in the United States. (Actually, there's provably no question any more, but the racist birthers like to pretend that there is.) But I'd bet anything that ever birther, every last one of them, voted for John McCain in the last election. And unlike Barack Obama, there has never been any question as to whether or not John McCain was born in the United States. John McCain was absolutely, positively, undeniably, without a doubt NOT born in the United States. John McCain was born on a U.S. naval base in the panama canal region. It was not incorporated U.S. territory at the time of his birth, and babies were not, at that time, automatically given birthright citizenship merely by virtue of having been born there. However, at the moment of his birth, John McCain was a natural born citizen of the U.S. because at least one of his parents was a citizen. This is precisely the same reason why Barack Obama would still be a natural born citizen even if he were not born in Hawaii, which he was. So, apparently, to the birthers, this standard of citizenship, while good enough for John McCain, is not good enough for Barack Obama, even though Obama's claim to natural-born citizenship is stronger than McCain's. And the only possible explanation for this level of hypocricy is racism.