After graduating from Clayton High in 2011 Harrison went to Clemson University; as a freshman in 2012 she was Atlantic Coast Conference champion in the 400 m hurdles and the 4 × 400 m relay and qualified for the NCAA championships in both hurdles races. She competed in the 2012 Olympic Trials in the 100 m hurdles but was eliminated in the heats. In 2013, she placed fifth in the 100 m hurdles (12.88) and fourth in the 400 m hurdles (55.75) at the NCAA outdoor championships.