The pilot stated that during the landing rollout she applied left rudder but the airplane veered to the left and right again. She further stated that she then applied full power to attempt to make the airplane fly, and affect a go-around, but it veered even more, and exited the runway into a ditch, and collided with the dirt bank at full power. The pilot also said that prior to the accident, there had been no mechanical malfunction or failure to the aircraft or any of its systems.