In 2011, Isaac was a member of the gold-medal winning team at the Pan American Games in Guadalajara that would qualify a spot for London in the team event. Isaac and the team would also finish fourth that year in the team events at the FINA World Aquatic Championships.
At the 2010 FINA World Cup, Isaac would go on to capture a bronze in the team event and she would also win silver in the duet. She improved on that silver from the World Cup by winning gold at the Commonwealth Games.
In 2009, Isaac and the team would finish just off the podium in the team events finishing fourth at the FINA World Aquatic Championships.
Isaac joined the national senior team in the fall of 2009.