A teenager accused of misdemeanor vehicular manslaughter in a crash that killed four of her friends pleaded not guilty last Wednesday in Marin County Superior Court. The criminal case is unfolding alongside a civil wrongful-death suit filed by the father of one of the victims that names both her and the county as defendants. The driver, a 17-year-old from Fairfax, is accused of losing control of her car last April while heading west on the…