She appeared on the cover for the British feature film Triggermen which starred Pete Postlethwaite, Adrian Dunbar, Neil Morrissey, Donnie Wahlberg and Michael Rapaport.
Her television work has included appearances on John Calshaw's Big Impression, Sky One's Max Magic and the ITV gameshow Love on a Saturday Night.
Theobald's television acting credits include: Eloise in TV series Mile High (a role she was officially uncredited for),[citation needed] Emma Casey (the personal assistant of Eli Knox, played by Shane Lynch) in the long-running TV series Dream Team and Nell MacMuffin in a special edition of the children's show Basil Brush entitled "Celebrity Bushwhack".
Her most significant role to date was as Sherry, the personal assistant to a London vice-lord played by Colin Salmon in the television miniseries Trial & Retribution VIII : Blue Eiderdown.
In March 2010, Theobald appeared in an episode of the BBC soap opera EastEnders, playing Bev, who (along with her friend Debs), unsuccessfully attempts to chat-up established characters Phil Mitchell and Minty Peterson.