After graduating from NIDA, she performed in Fiddler on the Roof, Carmen and My Fair Lady for Opera Australia, understudying Eliza Doolittle, and for other various companies she appeared in: Threepenny Opera, Risky Lunar Love, Miss Julie, Cabaret, The Bald Soprano, Lesbian Vampires of Sodom, Shafana & Aunt Sarrinah. In late 2008 she won the 2008 Sydney Cabaret Showcase, which led to a season at the 2009 Adelaide Cabaret Festival with her show Mrs.Bang: A Series of Seductions in 55 Minutes.
The show continued on to Edinburgh Fringe Festival, The 32nd Stage Song Review of Poland, The Sydney Opera House Late Night Lounge, Sydney Festival First Night 2011 and Melbourne Fringe Festival, where it won Best Cabaret 2010 and earned a Green Room nomination. She won Most Outstanding Performance for her role as Lady Macbeth at the GATS Festival 2009. She collaborated with UK cult band The Tiger Lillies in ‘Cockatoo Prison’ for the Biennale of Sydney 2010. Television work includes All Saints and Wild Boys. In 2011 she was involved in the development of Dream Lover: Bobby Darin the Musical, directed by Simon Phillips. She received stellar reviews for A Slowboat to Chinamans: A Ferry Tale, a historical vaudeville performed on a ferry in Sydney Harbour. Andy X a film directed by Jim Sharman in which Sheridan appears as Judy Garland (among other characters) was released in 2012. Sheridan most recently appeared as Amy Cantrowitz in the stage musical An Officer and A Gentleman.