She is a ten-time World Cup Series medalist on beam and has represented Greece at the 2000, 2012, and 2016 Olympic Games.

In 2014, Millousi began her season competing again at the Cottbus World Cup, though failed to make any of the event finals after errors on bars and beam in qualifications.

At the European Championships in Montpellier, Millousi made an error on the uneven bars and did not qualify to the final.

In 2016, Millousi first competed at the Doha World Challenge Cup where she qualified to both the beam and bar finals.

Millousi was 5th in the bar final and was on track to win another World Cup medal on beam until she crashed her double pike dismount to finish in sixth place.

At the Bern European Championships, Millousi submitted a new skill to the judges - a switch split leap in a stag ring position.

[4] Millousi competed at the Greek Championships in March where she placed third on uneven bars and second on balance beam.

[5] She later competed at the Baku World Cup where she won the silver medal on balance beam behind 2004 Olympic Champion Cătălina Ponor.