Her passion to give back led her to work for Mi Familia Vota in 2015 where she registered minority voters and organized citizenship fairs for low income families. She later joined the Bernie Sanders presidential campaign as a staffer in December 2015 and later became a first generation graduate from ASU. Belén is one of the co-founders of Undocumented Students for Education Equity at ASU, with the mission to openly address representation of undocumented students, contribute to a safe and respectful campus environment, and for equitable access to education and educational resources.
Following the Trump administration's decision to end DACA, Belén was arrested two times doing civil disobedience in Washington, D.C. demanding that Congress pass a Clean Dream Act. During her second arrest she was a member of the #Dream7 participating in a 6-day jail strike and hunger strike in DC jail.
During the 2020 presidential primary, Belén was the National Latino Press Secretary for Bernie 2020 where she continued the fight for a country that works for all of us not just the wealthy few. Most recently, Belén led progressive communications strategy for Mike Siegel for Congress (TX-10) and Victor Reyes for Congress (NM-1) as Communications Director.