A brief filed with the court last week claims that Chambers had a blood alcohol content (B.A.C.) level of 0.01-percent on the day of the crash that killed four, including a 2-year-old. The crash also left dozens injured.
In Oklahoma, one must have a blood alcohol level of more than 0.08-percent to be legally intoxicated.
Chambers, 25, is accused of driving a 2014 Hyundai Elantra into an unmanned police motorcycle before crashing into a throng of spectators.
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She faces 46 charges of assault and four for murder.
According to a probable cause affidavit, Chambers told Stillwater Police officer Kurt Merrill that she had a history of mental health issues. She claimed to have felt suicidal at the time of the crash, the affidavit says.
Chambers has not yet entered a plea.