Nancy was born in New York City. Her parents divorced and she grew up in Maryland, living with an aunt and uncle for some years.
She lived her first two years in Flushing, Queens, in New York, in a two-story house on Roosevelt Avenue. While her parents divorced soon after her birth, they had already been separated for some time. As her mother traveled the country to pursue acting jobs, Nancy was raised in Bethesda, Maryland, for the next six years by her aunt Virginia and uncle Audley Gailbraith.