Yuma County Sheriff's officials identified the victim Wednesday as 65-year-old Mary L. Clark of Granite Falls, Wash.
Sheriff's officials received a report of a single vehicle accident Monday night in Wellton.
Authorities say it appears the driver lost control for an unknown reason and crashed into a wash.
The driver got out of the vehicle and tried to walk away before collapsing.
Sheriff's officials say Clark was found dead at the scene some 300 yards from her vehicle.
Autopsy results show she died from internal injuries sustained in the crash.
The cause of the incident remains under investigation, but authorities say alcohol doesn't appear to be a factor in the rollover.