Cynthia K. Cashman, 23, of Topeka, Kan., pleaded not guilty to 12 counts in connection with the June 27 robbery of three youths in Steinhart Park.
Cashman is accused of threatening the youth with a knife.
Samuel Mier, 25, also of Topeka, is also charged in connection with the robbery and of threatening the youth with a gun. He has yet to be arraigned.
The youth reported they were ordered to swim in Steinhart Pond until the couple left the scene.
The youth described the car the couple drove, mentioning that it had a burned out fog light. Plattsmouth Police stopped the vehicle, noting its fog light was not working. The couple allegedly had cash and items the youth reported stolen from them in their car.
The trial has been set for Sept. 5.
Cashman faces three counts of robbery, three counts of use of a deadly weapon to commit a felony, two counts of first degree false imprisonment and three counts of terroristic threats.