Shortly after she joined the Club Rítmica Santfeliu of San Feliú de Llobregat and in 2007 she began training in the high performance center (CAR) of Sant Cugat with Iratxe Aurrekoetxea as part of the A.G.R.

[3][4] In May Júlia, Lidon Ainhoa, Rebeca Garcia, Elena Lopez, Lourdes Mohedano and Janira Rodriguez were 5th at the European Championships in Baku.

[2] In November she participated in the Euskalgym, and in December she competed in the Gymnasiade in Doha, being 7th in the All-Around, 6th with rope 8th with clubs and won bronze with ball.

[6] In March 2010 she was champion of the Trofeo Internacional of Huelva, and in June, she won silver in the Spanish Championships in Zaragoza in the honor category, only being surpassed by Carolina Rodríguez.

In September she was selected for the World Championships in Moscow, where she took 14th place in teams (alongside Carolina Rodríguez, Natalia García and Marina Fernández) and 50th in the All-Around.

[12] In September she participated in the World Championships in Montepellier, where she was 11th in the team category alongside Carolina Rodríguez and Natalia Garcia, and 43rd in the All-Around.

[15] Near the end of the year she competed in the 2nd division of serie A, the Italian club league, for Società Ginnastica Petrarca of Arezzo.

Although since November 2014 she started to train gymnasts in the Club Vallesà de Rítmica Cardedeu, Usón would continue competing until 2016, coming to participate with the C.E.R.