The Grand Traverse Sheriff's Office is investigating a one vehicle crash that occurred on Supply Road near Rennie Lake Road in East Bay Township.  The crash time has yet to be determined.  It is believed the accident happened sometime between late Sunday night and early Monday morning.  It was discovered by a passing motorist.  The victim driver, who was the sole occupant of the vehicle, is a 36 year-old Kalkaska County woman.  The vehicle was southbound on Supply Road when it left the roadway and went down an embankment prior to striking a tree.  The crash is currently under investigation.