Cornejo was born in San Luis, Argentina[2] and raised in Buenos Aires.
She started ballet at age four, and later trained at the Colon Theater Superior Institute of Art.
[4][5] She became a member of the corps de ballet the same year and was promoted to soloist in 2003.
[2] She left ABT in 2006 to join the Boston Ballet as a principal dancer.
[1] Cornejo is married to Carlos Molina, a fellow Boston Ballet principal dancer, whom she met in ABT.