Miciul competed in three swimming events at the 2000 Summer Olympics in Sydney. She achieved FINA A-standards of 1:03.17 (100 m backstroke) and 2:14.43 (200 m backstroke) from the European Championships in Helsinki, Finland. On the second day of the Games, Miciul placed twenty-fifth in the 100 m backstroke. Swimming in heat five, she rounded out the field to last place in 1:04.51, more than two body lengths behind leader Zhan Shu of China. Four days later, in the 200 m backstroke, Miciul posted a time of 2:16.71 from the final of five heats, but finished only in twenty-third place on the morning prelims. Miciul also teamed up with Alicja Pęczak, Anna Uryniuk, and Otylia Jędrzejczak in the 4×100 m medley relay. Leading off a backstroke leg in heat one, Miciul recorded a split of 1:04.18, but the Poles settled only for fourth place and twelfth overall in a final time of 4:11.08.