The woman's red Honda Civic came to rest almost completely upside-down after sliding down an embankment on the side of the freeway around 11:30 p.m. Monday.
According to the California Highway Patrol, calls came in about a wrong-way driver but officers were unable to find the car.
Then Tuesday morning, a county road worker on routine patrol saw the woman on the side of the roadway. She had somehow managed to make it there, despite her injuries.
"When I pulled up she was sitting on the side of the road there and she was all bloody and she was waving me down saying 'Help, help,' and then I asked her a few questions and she said she rolled her car last night and she was very grateful that I stopped to help her," said Jeff Crawford, who found the woman.
The 27-year-old woman is from Corona, according to the CHP.
She was treated for unspecified injuries at Inland Valley Medical Center.
The cause of the crash is under investigation.
