Delafosse graduated from Louisiana State University (LSU) with her Bachelor of Science in accounting in 2006 and from LSU Paul M. Hebert Law Center in 2009 with her Juris Doctor. She is a licensed Louisiana attorney. After graduating, Delafosse began her career as a performance auditor with the Louisiana Legislative Auditor. During her tenure there, she earned several certifications, including Certified Internal Auditor, Certified Government Auditing Professional, and Certified Public Accountant. From September 2014 until beginning her position with LDEQ, Delafosse served as the Director of the Budget and Financial Services Division at the Department of Revenue.