Coroner’s Assistant Chief Ed Winter said Monday that Jasmine Martinez of Somis died Saturday at Cedars-Sinai Medical Center in Los Angeles.
The Los Angeles County Fire Department said the girl and a parent were airlifted Friday from the park in Valencia.
Six Flags Magic Mountain released a statement that said Martinez was riding on Revolution and was found unconscious but breathing when she returned to the ride station.
“Our thoughts and prayers are with Jasmine’s family and friends during this difficult time,” the statement read.
The theme park said that state investigators determined the cause was not related to the operation of the ride and it was reopened.
An autopsy is pending, the coroner’s office said Monday.
The 113-foot-high looping steel coaster reaches speeds of 55 mph during a two-minute ride.
The Revolution was cleared to reopen shortly after the incident.
More than 45 million people have safely ridden Revolution since it was opened in 1976, the statement from Magic Mountain read.
Copyright 2015 KRON. The Associated Press contributed to this report.
Watch the video below for a first-person view of the ride.