Maribel Caicedo contested her first competition at international championships at the Youth South American Championships 2014 in Cali , where she won the gold medal in the 100 meter hurdles and bronze over the flat distance. At the U23 South American Championships in Montevideo , she just missed a medal in fourth over 100 meters and with the relay. In 2015, she won the silver medal in the Ecuadorian 4 x 100 meter relay at the Junior South American Championships in Cuenca . At the South American Championships in Lima , she finished seventh in the final. Then she celebrated her greatest success so far by winning the gold medal at the World Youth Championships in Cali. In conclusion, she won the silver medal at the Pan American Youth Games in Edmonton .
In 2016 she took part in the Ibero-American Championships in Rio de Janeiro , where she finished sixth. At the Junior World Championships in Bydgoszcz , Poland , she was disqualified in the run-up to the 100 meter hurdles and with the Ecuadorian relay she took eighth place in the final. At the U23 South American Championships in Lima, she also won the silver medal and gold with the relay. In 2017 she won the gold medal at the Junior South American Championships in Leonora over the hurdles and with the Ecuadorian relay. She was then nominated for the team for the World Championships in London , but was not used there. Before that, she won the bronze medal in the hurdles at the Pan American Junior Championships in Trujillo . In November she took part in the Juegos Bolivarianos in Santa Marta , where she won the bronze medal over the hurdles and the silver medal with the 4 x 100 meter relay in 13.46 seconds. In 2018 she reached the finals at the South American Games in Cochabamba , in which she was no longer able to start. She then won the silver medal in the hurdles sprint behind Andrea Vargas from Costa Rica in the Ibero-American Championships in Trujillo in 13.63 s and behind the team from Peru in the 4 x 100 meter relay in 46.76 s. In the following year she took part for the first time in the Pan American Games in Lima and was eliminated there in the hurdles sprint with 13.53 s in the first round and was disqualified with the relay in the run-up.