The pilot submitted a written statement. She said she did not conduct a control check prior to takeoff. During the departure roll when the airplane reached 70 miles per hour, she realized the gust lock was still installed. She attempted to remove it unsuccessfully and then reduced the throttle attempting to stop the airplane. The airplane went off the end of the runway, the nose gear separated, and it came to rest in a dirt field. The airplane sustained substantial damage to the firewall and right wing.