A 25-year-old woman was killed in a crash in Lebanon County on Wednesday afternoon.It happened on the 2900 block of Route 72 in Union Township around 4:30 p.m. According to police documents, the crash involved a tractor-trailer and a Chevrolet Cavalier. The Cavalier, driven by 25-year-old Vanessa Henner of Lancaster, crossed the median while driving northbound on Route 72 before striking the tractor-trailer head-on, according to officials.The Lebanon County coroner was called to the crash scene and pronounced Henner dead on the scene. The driver of the tractor-trailer was transported to the Hershey Medical Center by Life Lion EMS for unknown injuries. Pennsylvania State Police, Jonestown, are investigating.