[1] Sullastres was born in Torroella de Montgrí, Girona, Catalonia, and she started her career with UE L'Estartit's youth team in July 2001.

She played on youth teams that won several tournaments, and a league championship in the 2007–08 season, with only 7 goals scored against.

Sullastres joined the senior team at a young age, and with her good performances, became a first-string player.

[3] However, under the economic stress of traveling expenses and facing veteran teams with greater financial resources,[4] the club was relegated to the second division after five years in Primera División.

Her first appearance took place in Manresa against her former team L'Estartit in the semifinals of the Copa Catalunya, with a result of 8–0, and a few days later Barcelona won the Queen's Cup after defeating RCD Espanyol in the finals.

With that result, the team scored seven points, out of nine possible, and ended up qualifying for the final round to be played in Nyon, Switzerland.

For the next two years Sullastres was a part of the Under-19 team, and, finally, in the 2011–12 season, she was chosen to participate in the three phases of the European Championship.

Knowing that several traditionally powerful teams were not in the final round in Antalya, Turkey, Vilda's players held onto their hopes for defending the cup for one more year.

[16] However, with the silver medal, Sullastres was at a high-level in her sport, a good ending to the last year of her youth career.