FORT WORTH, Texas -The family of a 14-year-old girl who died in a go-kart crash at Texas Motor Speedway says she was bright and ambitious. FOX 4 spoke off-camera to Kierstin Eaddy’s father, Todd.He says his daughter not only loved what she was doing, but she was good at it and safe. Fort Worth Police say just before 10:00 a.m. Sunday during a timed race in the TMS parking lot, something went wrong. Investigators say Kierstin’s #4 go-kart crossed the finish line and kept going. Todd Eaddy says his daughter was a 2-time champion racer with seven years of experience and always wore a helmet, neck brace, vest and special racing suit. Police say Kierstin crashed through a wire barricade and stopped about 200 yards out in a field. She was transported by Careflite to Harris Methodist Hospital in Fort Worth, where she was pronounced dead. Investigators are trying to determine if there was a mechanical problem or if Kierstin might’ve had a medical issue that kept her from being able to stop the go-kart, which may have had a top speed of 40-45 mph. Kierstin’s family says she was always positive and trying to help people.She was involved in Girl Scouts, ran track and wanted to try out for the Junior Olympics.Her main goal was to be an engineer. She was also involved with charities such as the Spirit Horse Therapeutic Center of Corinth.That organization helps children overcome disabilities.