Gregg made her One Day International debut for the West Indies at the 1993 World Cup in England.[3] She and Patricia Felicien were the only Saint Lucians in the squad, and the first Saint Lucians to be selected in any West Indies squad.[4] At the World Cup, Gregg played in six of her team's seven matches, taking three wickets.[5] She was retained in the squad for the 1997 World Cup in India, and appeared in every match at the tournament.[3] In the ninth-place play-off against Denmark, she took 3/35 from seven overs, the best figures of her ODI career.[6]