Sheila is an alumna of the University of Maryland with a degree in Human Ecology/Management. She is married to Dr. Raymond Mahaffy, who is a dentist with a practice in Lanham. He completed his undergraduate degree at Maryland and concentrated in the pre-dental program through the School of Chemistry, Mathematics, and Natural Science. The couple's daughter Lynn also graduated from Maryland in 1995 and received her degree in biology from CMNS. Sheila and Ray hosted competitors during the International William Kapell Piano Competition and Festival, and they have commented on how much they enjoyed the experience. In terms of giving, they have given to The Clarice, the Kapell Competition, University Libraries, and various CMNS programs. Sheila is active in the Daughters of the American Revolution and other local civic groups.