Vaughan's senior season's best of 50-1.25 in the Shot put and 198-9 in the Discus fifth and first respectively in 2012. She won University Interscholastic League Texas State championships in discus titles in 2011 and 2012. She won 2012 Discus throw USA Junior Outdoor Track and Field Championships title with a and set the Discus throw American Junior record. She placed 4th in 2012 United States Olympic Trials (track and field) just weeks after graduating high school with a 3rd place American record holder Suzy Powell-Roos did not have a qualifying mark for the Olympics and neither did Vaughn, so the Olympic slot went to Gia Lewis-Smallwood.