Duncan began her career in Atlanta as an intern with the 2 live Stews, an American syndicated sports talk radio show on 790/The Zone. After a year, she was hired by Atlanta host, Ryan Cameron, to join the Ryan Cameron Show on V-103. While there, her roles included traffic reporter and on-air personality. Duncan hosted an afternoon show at the station in 2009 before moving to handle sports reporting for the morning Frank and Wanda show. During her time with V-103, Duncan also was a contributor with the Atlanta Falcons radio network pre- and post-game shows, the Atlanta Hawks sideline reporter, and a freelance sideline reporter for SEC and ACC football games on Comcast Sports South. Duncan landed a job as the traffic reporter at NBC Affiliate WXIA-TV in 2012.
Duncan joined NESN in 2014 as an anchor, reporter, and host. Duncan began co-hosting NESN Live Presented by Cross Insurance with Sarah Davis. The show features updates from NESN reporters and game-day analysis from Fenway Park, TD Garden, and Gillette Stadium. While at NESN, Duncan has also worked as a sideline reporter for the Red Sox and hosted coverage of Super Bowl XLIX between the New England Patriots and Seattle Seahawks from Glendale, Arizona.