She competed at the 2020 Summer Olympics, in 200 m.[3] Kaddari was born on 23 March 2001 in Cagliari, Sardinia, to an Italian mother and Moroccan-born father.

Aged 17, she won a silver medal at the 2018 Youth Olympics in Buenos Aires with a national under-18 best time of 23.45 seconds.

In 2019-20, she set national indoor under-20 records, ultimately lowering it to 23.85 s. In August 2020, while still a junior, Kaddari took a gold medal in the outdoor event at the Italian Championships, with a personal best of 23.30 s.[5] In September, she took 0.02 off the Italian under-20 record clocking 23.23 s in Bellinzona, Switzerland.

In May 2021, Kadari finished second at the European Team Championships, whose Super League events took place in Chorzów, Poland.

She won her second Italian title in June, and the next month, she earned a gold medal at the European U23 Championships in Tallinn, Estonia.