[2] Haralabidis attended University of Southern California, playing on the women's water polo team from 2014 to 2017.

Won a gold medal at 2011 European Junior Championship in Madrid, Spain.

She also won a bronze medal with the senior team at 2012 FINA World League in Changshu, China.

[8] Since 2017 she is representing the U.S. national team winning a gold medal at 2018 FINA World League[9] in Kunshan, China; and another gold at 2018 FINA World Cup[10] in Surgut, Russia.

[2] For the 2021–2022 season, Stephania plays, along with her sister Ioanna, for Greek club Ethnikos, based in Piraeus, Athens.