As a 14-year-old 9th grader, she carried Florida A&M University's Developmental and Research High School female track team to its first Class 1-A Florida High School Athletic Association state track and field championship win in over ten years by sweeping the 100 metres, 200 metres, the long jump and triple jump.

[3] She went on that year to compete as a representative of her country (BVI) in the Central American and Caribbean Games where she had a very good first showing.

In 2004, Harrigan transferred to the University of Alabama where she honed her athletic prowess even further becoming a SEC powerhouse and an NCAA finalist.

The OECS sports desk named her most outstanding female athlete in 2006 for her top performances in international meets.

At the 2008 IAAF World Indoor Championships in Valencia, Spain, Harrigan finished third in the final of the Women's 60m posting a new BVI national record of 7.09 sec.