Pusey won Jamaica's first world championship relay medal at the 1983 World Championships in Athletics, running in the 4×100 metres relay. She had her career peak in 1981 when she won bronze medals in the individual 400 m and relay at the 1981 IAAF World Cup and set two championship records to take a 200 metres/400 metres double at the Central American and Caribbean Championships in Athletics. As a result of her achievements that year, she was given the Jamaican Sportswoman of the Year award.