[1] Greaves achieved much success in regional age category competitions.
After a runner-up finish in the 100 metres hurdles at the 2001 CARIFTA Games (youth section), she returned the year after to win a 100/300 m hurdles double at the 2002 CARIFTA Games.
[2][3] She was a double relay medallist in the youth section at the 2002 Central American and Caribbean Junior Championships in Athletics, including a championship record in the 4 × 100 m relay alongside Shelly-Ann Fraser, Anneisha McLaughlin and Diane Dietrich.
[4] She further established herself individually with a gold medal in the hurdles at the 2005 Pan American Junior Athletics Championships.
[5] Her last international age category medal came at the 2008 NACAC Under-23 Championships in Athletics, where she was behind Americans Tiffany Ofili and Kristi Castlin.