It happened before 4 am at Highway 180 and Brawley.
Investigators say a 30-year-old woman lost control of her car and rolled it down the embankment off the side of the road.
Officers say the driver swerved after hitting a fox, and that's when she veered off the road.
Authorities say the driver was walking around after the crash but went to the hospital as a precaution.
The CHP says the driver is suspected of driving under the influence of alcohol.