Lanigan joined Dollar General in July 2002 as vice president, general counsel and corporate secretary. She was promoted to senior vice president in October 2003 and to executive vice president in March 2005. Previously, Lanigan was senior vice president, general counsel and secretary with Zale Corporation, a specialty retailer of fine jewelry. Her legal experience also includes positions with Turner Broadcasting System, Inc. and the law firm of Troutman Sanders.
Lanigan received her undergraduate and juris doctorate degrees from the University of Georgia. Lanigan is a director on the board of the Dollar General Literacy Foundation.