Day was born and raised in Santa Fe, New Mexico. Her father was a local doctor, rancher and small business owner outside of Glorieta, New Mexico, while her mother managed a restaurant on the Santa Fe Plaza. At an early age, Day became interested in language, political science and the arts. After graduating with a Bachelor in Arts from Colorado College, Day witnessed the social and political realities of four countries learning to speak three languages fluently and experiencing what works and doesn't work in developing economies abroad.
Before returning to attend law school at the University of New Mexico, Day worked as a Public Interest Fellow at the American Civil Liberties Union in Denver, Colorado, where she worked on several public policy issues including voter rights and the preservation of free speech. Day became interested in criminal law and was recognized for her work and dedication to providing pro bono legal services to the community, including working for the release of a falsely accused man who had been wrongly incarcerated for 28 years.
After law school, Day continued to serve her community as an American Bar Association Young Lawyers’ Division National Scholar and was named the youngest serving President of the Board of Directors of the New Mexico Womens’ Bar Association in 2013. In 2014, Day earned her Master In Laws degree in Aviation and Space law from McGill University.
Following her Master's program, Day acquired experience at the Federal level in Washington, D.C. practicing regulatory law and interacting with the U.S. Department of Transportation, the Federal Aviation Administration, and the National Transportation Safety Board.
Since coming back home to New Mexico, Day has focused her efforts locally to help her community.