Growing up, she set consecutive Italian records in her signature event of the 200 metres. 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.