In December 1989, she appeared as the Wicked Queen Griselda in a production of Snow White and the Seven Dwarves at the Hexagon Theatre in Reading, which subsequently transferred to the Grand Theatre, Leeds. She has since reprised the role in numerous other incarnations of the show, including productions at the Grand Theatre, Swansea (1990/91), the Broadway Theatre, Catford (2008/09), the Marina Theatre, Lowestoft (2010/11), the Palace Theatre, Redditch (2011/12) and the Harlequin Theatre, Redhill (2013/14).
Kelly has also performed the comparable roles of the Evil Queen or Fairy Carabosse in various productions of Sleeping Beauty at the Middleton Arena, Rochdale (2009), the Connaught Theatre, Worthing (2012/13) and elsewhere. Kelly has also appeared as the Wicked Witch in a pantomime version of The Wizard of Oz.