In November 2018, Pasteur was elected to the Baltimore County School Board in Councilmanic District 2, receiving 66.1 percent of the vote in the general election. In December 2021, the school board selected Pasteur to serve as its vice chair. In June 2019,
Maryland Senate President Thomas V. Miller Jr. and
House Speaker Adrienne A. Jones named Pasteur to serve on the
Blueprint for Maryland's Future Funding Formula Workgroup. In January 2020, the Baltimore County School Board voted to endorse the recommendations of the
Kirwan Commission. In February 2022, Pasteur filed a declaration supporting a lawsuit challenging Baltimore County's new council districts for diluting the power of Black voters. Pasteur resigned from the school board on February 11, 2022, to run for the Maryland House of Delegates in District 11A. In June 2022, Governor
Larry Hogan appointed retired middle school teacher Felicia Stolusky to serve the rest of her term. Pasteur was the only candidate to run for the district.
In the legislature Pasteur was sworn into the Maryland House of Delegates on January 11, 2023. She is a member of the House Judiciary Committee. ==Controversy==