Perales made her international debut for Spain at the IPC World Championships in Christchurch , New Zealand in 1998 , where she earned a bronze in the 50 m freestyle event ; three fourth-place finishes in the 4 x 50 m freestyle 20 points relay , 4 x 50 m medley 20 points relay and the 400 m freestyle ; a seventh-place finish in the 100 m libre event ; and an eighth-place finish in the 50 m butterfly .
She finished in seventh-place in the 100 m libre event and finished eighth in the 50 m butterfly .