Omrani competed in combined track and field events from a young age and placed 14th at the 2005 World Youth Championships in Athletics (her first major competition). She competed in her first major meetings in 2006 (Meeting International d'Arles and Multistars) and won the French junior title with a best of 5333 points. She bettered this by 43 points to place eleventh at the 2006 World Junior Championships in Athletics. At the 2007 European Athletics Junior Championships she managed only 17th place.