Castaño has a spinal cord injury after she was shot at a shopping mall in Medellín, Colombia in December 2008.

Her brother, Carlos Rousselvelt, is also a para-athlete, and has the same injury after a similar incident five months earlier.

[3][4] In the javelin throw, she won silver, only beaten by Angela Madsen of the United States.

[5] The following year, she participated in the 2016 Summer Paralympics, where she came fourth in the discus (F55) and eighth in the javelin throw (F56).

Castaño participated in the 2019 Parapan American Games in Lima, Peru, and came second in discus in the F55 class, behind Rosa Maria Guerrero from Mexico.