(Gaston, OR) -- Authorities are investigating a crash that killed a 14-year-old girl in Washington County. Oregon State Police say 18-year-old Stephanie Cadd of Hillsboro swerved to avoid a car that was driving in her lane on Oregon 47 and was t-boned by a vehicle in the oncoming lane. The 14-year-old, who was a passenger in Cadd's vehicle, died at the scene. Cadd was critically injured, and Jill Yoder of Hillsboro, the driver of the other vehicle involved in the crash, suffered serious injuries.