The pilot’s misidentification of a mountain pass at night, which resulted in controlled flight into terrain. Contributing to the accident were the pilot’s overconfidence based on her previous aviation experience and fatigue due to both the time of the flight and her work schedule. Also contributing was the pilot’s decision not to install an automatic dependent surveillance-broadcast (ADS-B) system, which forced a flightpath close to mountainous terrain to avoid the Mode-C and ADS-B Out veil.