She was first in the 400 metres at the African Northern Region Junior Championships in July 2006, but was beaten into second by Aicha Rezig in her speciality. She reached the semi-finals of the 2006 World Junior Championships in Athletics and ran at the 2007 IAAF World Cross Country Championships, taking 46th place. Later that year, she ran a personal best of 2:02.60 at a meeting in Biberach, Germany – a mark which made her the third fastest junior woman that year. She won two medals at the 2007 African Junior Championships in Athletics, taking the silver in the 800 m and a bronze in the 1500 metres. The highlight 2008 for Hachlaf was a fourth-place finish at the 2008 African Championships, where she finished in a time of 2:04.74 behind Agnes Samaria.