Lafleur voiced Sailor Uranus in the English dub of Sailor Moon S: The Movie - Hearts in Ice. She voiced the same role in Sailor Moon SuperS: The Movie: Black Dream Hole and in the Sailor Moon English television series in episodes throughout the year 2000. She has provided voiceover work for video games Viewtiful Joe: Red Hot Rumble (2005), Devil May Cry (2001), and M.U.G.E.N (1999).
From 1998 to 2004, she played various roles in five episodes of History Bites. In 2008, Lafleur began a recurring role as Molly on Ugly Betty. She stayed on the show until 2009. From 2008 to 2013, Lafleur starred as herself in David Tutera's CELEBrations (formerly My Fair Wedding.) From 2014 to 2015, she guest starred in several crime shows, including Bones, NCIS: Los Angeles, Criminal Minds, CSI: Crime Scene Investigation, and Major Crimes. Her most recent role was in 2015 as Franny Nicholson in Bones.