Heading off to a lakeside vacation, most girls probably would pack a swimsuit and suntan lotion. But Madeline Bowne is not most girls. Last August, with her family bound for New York’s Finger Lakes, the middle schooler put her camera bag, filled with audio and video equipment, atop her “don’t forget” list. Nearby her family’s vacation spot was Seneca Falls, home to Women’s Rights National Historical Park — the perfect place to shoot some footage for her documentary on the 19th Amendment to the Constitution, which won women the right to vote. She planned to enter it in “StudentCam,” C-Span’s annual video documentary contest.