Kidder appeared off-Broadway in "The Vagina Monologues" in December 2002, and toured with the show for two years. After this, she appeared on "Robson Arms", a Canadian sitcom set in an apartment block in Vancouver's west end. She played a quirky neighbor of the main cast members. She also had a cameo in "Rich Hall's Election Special" on BBC Four. In 2006, Kidder played Jenny Schecter's mother Sandy Ziskin on "The L Word"; her character was a repressed Jewish woman coming to terms with her daughter's sexuality. In 2007, Kidder began appearing on the television series "Brothers and Sisters", playing Emily Craft. In 2004, Kidder briefly returned to the Superman franchise in two episodes of the television series "Smallville", as Bridgette Crosby, an emissary of Dr. Swann (played by her "Superman" co-star, Christopher Reeve).