In August 2022, Christensen defeated Randy Railsback in the Republican primary election for the 2nd district of the Missouri House of Representatives.[10] The 2nd district covers Grundy, Harrison, Caldwell, Daviess, and Worth counties.[9] In November 2022, she defeated Lois Pontius in the general election, winning 82 percent of the votes.[11] She assumed office for her first two-year term in 2023 at the age of 24.
Before being elected, Christensen served in the White House as an executive assistant to the Director of Presidential Personnel John McEntee under the Trump administration, as well as a war room analyst for Donald J. Trump for President, Inc. She also worked as an intern for U.S. Senator Roy Blunt, and a communications assistant for the Congressional Office of Rep. Marjorie Taylor Greene.[12]