The airplane was substantially damaged when it landed with partially extended landing gear at about 0850 Pacific time. The Private pilot and single passenger were not injured. Visual conditions prevailed. The pilot later stated that she lowered the landing gear and saw a green light, which indicated that the gear was down and locked. She did not look out the window to verify that the main gear was down. She touched down and the airplane veered off the runway. The nose gear was down, but the main gear legs were retracted.