Danielle started her swimming career at the age of five with 'learn to swim' classes with the Sea Jays Swim Club, as she became more able, she started competing competitively, coached by her mother, Karen Beaubrun. Six years later, at the age of eleven, she began her training with the Cuban coach, Claribel Blanco with the Rodney Heights swim club. She remained here from March 2002 till December 2004. Her training was then taken over by the Brazilian, Cesar Bolzan.
2005 onwards
In the 2005 CCCAN Championships, in Santo Domingo, she won the silver medal for the 50m breaststroke, and at the 2003 CCCANs, in Mexico City she won the bronze for the same competition. At the 2009 meet, she won the 18&Over 200 breaststroke in a new St. Lucian Record (2:48.96), and also lowered her national mark in the 50 breaststroke (33.83).[2]
In 2005, she was awarded St Lucias Junior Sportswoman of the Year.
In 2006, Beaubrun represented Saint Lucia in the Commonwealth Games, she was a semi-finalist in the 100 meters breaststroke. At the 2006 CAC Games, she qualified for the 100 and 200 meters breaststroke and she came 4th overall in the 50 meter breaststroke.
In the 2007 she was the only Saint Lucian swimmer to achieve qualifying times for the Pan American Games 2007. She made it into the semifinals and set a new St.Lucian Record for the 100 meters breaststroke.