In 2004, Mirela participated in "Eurojunior", the Spanish national selection process for the Junior Eurovision Song Contest 2004, where she competed with María Isabel and Blas Cantó. She reached the national final with her song "Conocí el amor" ("I Met Love"). She narrowly lost out to María Isabel, who represented Spain and overall went on to win the European final with the song "Antes muerta que sencilla".