Police say an 83-year-old woman died from exposure to the cold after crashing her car in eastern South Dakota.

KELO-TV reports that police believe Nina Bradenburg left her car to look for help after crashing on a gravel road near the tiny rural town of Revillo on Saturday. Revillo lies just west of the Minnesota state line and 115 miles (185 kilometers) north of Sioux Falls.

Police officers found the car first but with no driver inside. They found Brandenburg's body in a ditch on Sunday, where she had died of exposure. The National Weather Service says temperatures in the area fell as low as 2 degrees (-17 Celsius) overnight.