Adacia Chambers, 25, could face at least 10 years in prison on each murder count. She has remained jailed in her hometown of Stillwater on USD 1 million bond since the October 24 crash that left four people dead, including an Indian, and at least 46 others hurt, including many children.
A judge also has ordered a psychological evaluation for Chambers.
A telephone message left today with Chambers' attorney, Tony Coleman, wasn't immediately returned.
Police initially suspected Chambers was driving under the influence of drugs when she crashed into the parade crowd, but Stillwater Police Capt. Kyle Gibbs said Wednesday the results of a blood test have not been returned.
More From This Section
Gibbs said Chambers stopped talking to investigators shortly after her arrest, and that it's still not known what may have prompted her to drive into the crowd.
The parade was part of Homecoming activities at the university. Homecoming is the tradition of welcoming back a school's alumni and takes place at many U.S. Universities, colleges and high schools. It usually includes sports and cultural events and a parade.