LAWRENCE, Kan. (AP) — The 26-year-old Missouri woman charged with intentionally driving her children into the Kansas River waived her right to a preliminary hearing and did not enter a plea at a brief court hearing.

Scharron Dingledine, of Columbia, Missouri, on Tuesday waived her right to a preliminary hearing. Her attorney, Carol Cline, said she and her client need more time to prepare before Dingledine’s arraignment, which is scheduled for Dec. 3. No trial date is scheduled.

Dingledine is charged with first-degree murder and attempted first-degree murder. Police allege she drove her car into the Kansas River near Lawrence on Aug. 3 in an attempt to kill her children and herself. Her 5-year-old daughter died and a 1-year-old son was critically injured. The boy remains hospitalized in fair condition.