Who is Amy Martin from Across the Universe and what is their importance?

Amy Martin is a seventeen-year-old girl from Sol-Earth. She has red hair and green eyes, loves photography and marathon running. Amy is described as a smart girl, who is outraged, frightened, and perhaps too curious for her own good at times.... she is independent and headstrong. Amy plays a large part in unraveling the mysteries onboard Godspeed, and in the end, she will stay by Elder's side, as he learns how to operate the ship.