Frias began her career in activism after the 2018
Stoneman Douglas High School shooting in
Parkland, Florida. While a student at
State University of New York at Oswego, Frias became active in organizing efforts to support the gun control advocacy organization
March for Our Lives as well as accessible transportation for students to attend the March For Our Lives protest, and was appointed the New York State Director for the organization in August 2018. By working with college students, the organization collected almost 470,000 absentee ballots. In 2018, Frias also became the lead organizer in New York for
Future Coalition, a youth-led voting rights organization, during the
Walkout to Vote campaign that encouraged high school students to leave school to vote. As the lead organizer, she coordinated with high school organizers, the local
March on the Polls chapter and
Gays Against Guns for a
Union Square rally and march on election day, when public schools were closed across New York City. She was also an official spokesperson at the
September 2019 Climate Strike protest in New York City, which was part of coordinated international protests also known as the Global Week for Future. At age 21, Frias was elected as the West Harlem county committee representative for the Democratic party in New York, and then worked with her staff as a liaison between community members and elected officials. She used social media to share updates about her progress, and told
NBC News, "I think me being sick made it a lot more personal for people, and I think that's what people are needing right now, a tangible person to connect to." During the conference, she participated in discussion forums organized by
The New York Times about leadership. She told
The New York Times, "We always say our leaders have failed us. We are the new leaders. We are the ones who are going to make the decisions going forward." == Personal life ==