In 2003, Kelly-Ann was the first Trinidad and Tobago female sprinter to win a medal in a global track meet when she ran 11.58 seconds to take bronze in the 100m at the 3rd IAAF World Youth Championships in Sherbrooke, Canada.

Less than a year later, she took 200m gold and 100m silver at the XVI Central American and Caribbean (CAC) Junior Track & Field Championships, in Veracruz, Mexico.

She followed that up with fourth place in the 200m final at the 10th IAAF World Junior Championships, in Grosseto, running 23.46 and missing out on bronze by one-thousandth of a second.

[1] In May 2009, at the Grande Prêmio Brasil Caixa in May 2009,[2] Kelly-Ann set a Trinidad and Tobago national record in the 200 metres finishing with a time of 22.60 seconds.

Although she had had success in the collegiate ranks under head track and field coach Dennis Shaver, the change of environment brought the desired results.

Kelly-Ann then joined American Shalonda Solomon (who was second in the individual 100), Cydonie Mothersill of the Cayman Islands and Debbie Ferguson-McKenzie of the Bahamas to win the women's 4×100 relay for the Americas in a time of 43.07.

[5][6] The Court of Arbitration for Sport eventually cleared Baptiste to compete in January 2015; the effective duration of her ban was 21 months, backdating to 24 April 2013.