[1] Earnshaw made her West End debut in the Original London Cast of Wicked, at the Apollo Victoria Theatre,[2] as a Glinda / Nessarose understudy.
In 2013, Earnshaw played Lady of the Lake in Spamalot at The Playhouse Theatre in the West End[4] and Audrey in Little Shop of Horrors at Aberystwyth Arts Centre.
[5] She created the role of Sam in Payback (at the Riverside Studios) in June 2013,[6] opposite Matthew White, and Christmas 2013 saw Earnshaw appear as Fairy in Jack and the Beanstalk at Sheffield Lyceum.
[11] Other works she has appeared in include; Alice In Wonderland (West Yorkshire Playhouse), After The Turn (Courtyard Theatre) and The Royal Variety Performance (London Coliseum).
In 2014 Sarah appeared in the original cast of The A-Z of Mrs P at Southwark Playhouse[13] produced by Michael Peavoy and The Booking Office and directed by Sam Buntrock.