Dawn Wells, 69, was taken into custody after being caught with marijuana in her vehicle while driving home after a surprise birthday party on October 18.
Wells pleaded guilty as part of a deal last month to one count of reckless driving.
2Police reports show she was pulled over by a Teton County Sheriff's deputy who claims Wells' car swerved several times on State Highway 33.
Deputies seized four half-smoked joints and two small cases used to store marijuana from the vehicle, according to police reports.
Defense attorney Ron Swafford says a friend of Wells' voluntarily testified that he had left a small amount of marijuana in the car after using the vehicle earlier in the day.