A 19-year-old woman was killed Thursday when her car crashed into oncoming traffic on the Massachusetts Turnpike in West Springfield, officials said. The woman, who has not yet been identified, was pronounced dead at the scene, State Police said in a statement. The woman was driving eastbound at 12:36 p.m. when her car struck a box truck driven by Christopher Perry, 39, of Chicopee, State Police said. Perry was not injured. The woman’s car then swerved into the high-speed lane of westbound traffic, where she was struck by a tractor-trailer truck driven by Joshua Lawrence, 23, of Maine. He suffered minor injuries, State Police said.