56-year-old Vivian Cockrell entered her pleas Monday and a judge scheduled a Feb. 10 trial.
Cockrell is charged with felony motor vehicle homicide and misdemeanor misuse of a learner’s permit.
Prosecutors say Cockrell was driving a Cadillac that struck a horse-drawn buggy carrying 21-year-old Fannie Yoder and her 17-year-old brother Reuben.
The two were on their way to church at the time of the accident. Reuben Yoder died and Fannie Yoder was critically hurt.
Cockrell was driving on a learner’s permit when the July 21 crash happened on Nebraska Highway 8/50 east of Pawnee City.