"All of our Presidents have, to date, been born in the 50 states. Notably, President Obama was born in the state of Hawaii, and so is clearly a natural born citizen." Justice Sandra Day O'Connor
As I say, there is no significant authority, conservative, liberal, or in between, who agrees with you.
But it's not just people like Supreme Court Justice O'Connor. It's the entire weight of law and history, including all of our early legal scholars and experts.
Sandy is entitled to a personal opinion, but in a court of law, she would have to go against legal precedent set by at least 27 Supreme Court justices who agreed that NBCs are those born in the country to parents who are citizens. Second, Sandy has no legal proof that Obama was born in Hawaii. The only thing that has been "presented" is hearsay from a legal standpoint.