The Orange County Coroner's office tells Action News Sara Spagnolini died on July 10.
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In February, she did not show up for her sentencing for the crash that killed 10-year-old Francine Salazar.
The crash happened in 2019 when Spagnolini's vehicle blew a stop sign and slammed into Salazar's family car.
The girl died at the scene.
The California Highway Patrol says Spagnolini was driving 60 to 80 miles an hour and had a suspended license.
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The cause of her death is under investigation.
Authorities say it may take at least four months to determine a cause.