She'll be fine. You have overestimated the importance of foreign policy "experience." What matters most in a leadership role are the people you surround yourself with. No president makes a major foreign policy decision without consulting the opinions of their experts, including national security advisor, joint chiefs of staff, etc.
Obama is dangerous to this country not solely because he is an imbecile, but because of the people he will surely surround himself with. I feel confident that Sarah will choose the people she surrounds herself with wisely.