Arango Buitrago first became involved about a year after being approached by Chope. She first tried out running whilst blind at the Estadio Alfonso Galvis Duque and from there she developed a passion for the sport. In 2011, she was selected for the Colombia national team at the IPC Athletics World Championships. She competed in two events, the 400m and 800m races. In the 400m qualifiers she was placed in the last of the three heats. Although she finished second behind Britain's Tracey Hinton, her time of 1:07.94 was the fastest losing time of the heats and she took the fourth space in the finals. In the final, despite running a season's best of 1:05.88, Arango Buitrago finished outside the medals in fourth place. In the 800m qualifiers she posted a time of 2:31.31 in the second heat to go through in first place setting an area record. She ran a slower time in the final, but it was still enough for her to finish second behind the Czech Republic's Miroslava Sedlackova to collect the silver medal.