Sanchez was born in University Heights and grew up in the Kingsbridge neighborhood of the Bronx.[3] She is the daughter of Mixed-race Dominican immigrants who immigrated to the United States in the 1970s.[4] She has a son, born in August of 2022.[5]
While at Harvard, Sanchez worked for an immigration non-profit organization and tutored incarcerated GED students. After receiving her undergraduate degree, she worked in constituency services for councilman Fernando Cabrera. While at Princeton, Sanchez interned at the White House in the summer of 2012 during the presidency of Barack Obama.[2]
In 2015, Sanchez was elected to serve on the board of the Bronx Young Democrats.[6] She also worked under Mayor of New YorkBill de Blasio as senior advisor for housing, economic development and labor.[2]
In the final count, Sanchez received 62.4 percent of the vote in the Democratic primary against runner-up Yudelka Tapia, who received 37.6 percent. Sanchez won the general election against Republican opponent Shemeen Chappell.[10] As of 2024, she serves as the City Council's chair of the housing and buildings committee.[11]