Prior to serving on the Rice staff, Carrethers played for the United States Professional Volleyball League touring team under the direction of world-renowned coach Arie Selinger. She was a part of the group that competed in the Dominican Republic against the national team.
Carrethers guided Rice to a 72-64 record during her four seasons as a player, including two 20-win campaigns. She completed her eligibility as the school's all-time leader in career block assists (363). Carrethers still ranks third all-time at Rice in career kills (1,358), second in career total blocks (447) and second in career hitting percentage (.280).
As a fifth-year senior in 1998, she led the Owls to their best season ever with a 23-10 overall record and a 10-4 mark in the WAC after missing the 1997 season due to a broken ankle. During that season, Carrethers was named AVCA National Player of the Week. She hit .358 as a senior and earned first-team all-WAC honors; she was also bestowed the Hally Beth Poindexter Award as the team's most outstanding player.
Upon graduation from Rice with a bachelor's degree in exercise science, Carrethers spent the spring of 1999 coaching the Texas Elite Volleyball Clubs' 16s division. The following spring, she led the 14s division of the Sport Performance Volleyball Clubs.