STILLWATER, Okla. (AP) – An attorney representing the woman suspected of crashing her car into a crowd at a homecoming parade says he believes she suffers from a mental illness.

Tony Coleman, who is defending Adacia Chambers, says there is no indication that she had been drinking or taking drugs before police say she drove into spectators at the Oklahoma State University parade on Saturday morning.

The 25-year-old woman was arrested on a driving while intoxicated charge after the crash, which killed four people and left 47 injured. Police are awaiting results of toxicology tests.

Coleman says there were warning signs from her behavior before the crash, including an inability to sleep. He added: “In my opinion, Ms. Chambers suffers from a mental illness.”