N57354

The pilot stated she attempted a landing with a 10 degree flap setting on runway 35 (2,987 feet by 50 feet, concrete). Calm winds were reported by the pilot. The airplane, which was equipped with a tricycle landing gear, touched down in a "perfect" three point landing at about 75 knots. The pilot told the Federal Aviation Administration inspector that the touchdown point and speed was about 1/2 down the runway at about 105 knots. The pilot "realized" that the airplane speed was "too fast" and then performed an aborted landing by retracting flaps to 0 degrees and adding full power. The airplane impacted a traffic sign and terrain when it overran the runway without becoming airborne, which resulted in substantial damage to the firewall. The pilot sustained minor injuries.