Hachlaf was born in Khénifra, and began her international career at an early age, competing in the 800 metres at the 2003 World Youth Championships in Athletics when she was fourteen.

[2] She had greater success at the 2004 World Junior Championships the following year, as she recorded a personal best of 2:06.44 in the heats and reached the event final, finishing ninth.

She closed her year with an appearance at the 2009 Jeux de la Francophonie, where she won another silver medal, just beaten by her compatriot Seltana Aït Hammou.

[7] At the start of the outdoor season she scored an unexpected win over her compatriot Hasna Benhassi at the Meeting International Mohammed VI d'Athlétisme de Rabat in a personal best run of 2:00.63.

[14] A few days later she ran at the Golden Gala in Rome and had a significant victory over World Championship medallists Janeth Jepkosgei and Jenny Meadows.