She is known for appearing in the independent films The Do-Deca-Pentathlon (2012), The Pretty One (2013), The Midnight Swim (2014), MAD (2016) and 6 Years (2015).

On television, Lafleur has appeared on the HBO series Big Little Lies, Room 104 and Animals., the Showtime series Billions, American Crime on ABC, Married on FX, Chicago Fire on NBC, Workaholics and Review on Comedy Central, Childrens Hospital and Newsreaders on Adult Swim, and Major Crimes on TNT.

[4] On April 30, 2016, Lafleur married actor and director Ross Partridge, after dating for ten years.

Lafleur began her acting career with small appearances in the films Baghead (2008),[6] and Jeff, Who Lives at Home (2011),[7] both of which were written and directed by Jay and Mark Duplass.

She starred as Annie, one of three sisters who returns home when their mother goes missing after diving in a lake.