October 26, 2015 12:10 PM EDT

The lawyer representing the woman charged with four counts of second-degree murder after she plowed through a crowd of people at Oklahoma State University’s homecoming parade said Sunday he doesn’t believe his client was intoxicated — but that she has showed “warning signs” of a mental illness.

Adacia Chambers, 25, was arrested and charged with driving under the influence Saturday after she plowed through revelers on the sidelines of the Stillwater event, killing four and injuring dozens more. The second-degree murder counts were added Sunday, Stillwater police said.

“She wasn’t a drinker. She didn’t do drugs,” Chambers’ attorney, Tony Coleman, said…

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