Her exit storyline was purposefully ambiguous so that the audience was not aware Sarah would return .
Sarah was written off the show in late 2010 when Billing took a four - month break to star in a play .
Sarah 's exit storyline was purposefully ambiguous so that the audience was not Sarah Sarah would return .
Sarah was written off the show in late 2010 when Billing took a four - month break to star in a play .