At nine years old, Farb made her stage debut as Young Jane Eyre in the world premiere production of
Jane Eyre. The musical opened at the
Royal Alexandra Theatre in
Toronto on December 3, 1996, and closed on February 1, 1997. Farb made her
Stratford Festival debut in 2013, where she was a member of the ensemble in that season's production of
Romeo and Juliet. Between 2013 and 2017, Farb appeared in eight other Stratford Festival productions. In 2015, she starred as Cordelia in Stratford's production of
King Lear opposite
Colm Feore, which was filmed by
CBC and later had a limited theatrical release throughout Canada. In 2017, Farb starred as Juliet in
Romeo and Juliet which was also professionally filmed and had a limited theatrical release across Canada. In 2015, Farb performed her one-woman play,
R-E-B-E-C-C-A, at the
Theatre Passe Muraille. It is a story about her younger sister and the challenges of growing up with a developmental disability. Farb also starred as Anne Frank in a production of
The Secret Annex, a play that hypothesizes what would have happened if Anne survived World War II. In 2016, the
Art Gallery of Ontario partnered with The Musical Stage Company and Acting Up Stage Company to present three short musicals based on art exhibits on display at the museum. Farb and
Britta Johnson chose
He Is Coming by Otto Willem Albertus Roelofs, which was performed in April 2016. Farb starred as Medium Allison in a Canadian production of
Fun Home. The musical played at the
CAA Theatre between April 13 and May 16, 2018. At the 2018
Dora Awards, Farb was nominated for Outstanding Female Performance in a Musical. In 2019, Farb made her
Broadway debut in
Harry Potter and the Cursed Child, where she played Delphi Diggory. In 2022, Farb reprised her role of Delphi Diggory in the Canadian premiere production of
Harry Potter and the Cursed Child. The play began performances at the
Ed Mirvish Theatre in
Toronto on May 31, 2022, and closed on July 2, 2023. Farb again collaborated with Johnson, when they co-created the musical
Kelly v. Kelly. The musical had its world premiere at the Berkeley Street Theatre in
Toronto, where it played between May 26 and June 18, 2023. At the 2024 Dora Awards, it was nominated for six awards including Outstanding New Musical and Outstanding Musical Theatre Production. == Theatre credits==