Dionne began her career in 1989 as a member of the United States Air Force Medical Corp. A veteran of the Gulf War and recipient of the United States Air Force Medal of Achievement, she supported European Aeromedical Evacuation Operations for 7 years. She is a graduate of the University of Texas, the Air Force School of Nursing, and the Air Force School of Aerospace Medicine.Dionne joined US McDonald's Corporation in 2002, assuming the role of Manager of US Restaurant Food Safety in 2013 where she supports more than 14,000 McDonald’s restaurants across the United States.

In addition to her role as Manager of US Restaurant Food Safety for McDonald’s, Dionne is an active member of the National Environmental Health Association and the Association of Food and Drug Officials. She is also a past Executive Board member for the Central Atlantic States Association of Food and Drug Officials; a current Executive Board member for the Mid-Central Atlantic States Association of Food and Drug Officials; and a charter member of the national food safety forum Partners with a Common Purpose.