[9] Grant originated the role of Cassandra in Christopher Durang's comedy Vanya and Sonia and Masha and Spike since the beginning of the show's development as a one-act play.

[10] She performed alongside Sigourney Weaver, David Hyde Pierce, Kristine Nielsen, Genevieve Angelson, and Billy Magnussen in the world-premiere at the McCarter Theatre Center in Princeton, NJ from September to October 2012[11] before moving to the Lincoln Center Theatre in an off-Broadway run October 2012 to January 2013.

[15] Grant was nominated for a Tony Award for Best Featured Actress in a Play in 2013 for her performance as Cassandra in the comedy Vanya and Sonia and Masha and Spike.

[20] After she departed NCIS: New Orleans in 2018, she was cast in the recurring role of FBI Agent Tess Rogers on the third season of the Netflix horror-comedy series Santa Clarita Diet.

[21] In 2020, Grant recurred on the third season of HBO Max's Search Party in the role of first-time, in over-her-head attorney Cassidy.