In 2002 Guadagni made her playwriting debut with In the Wings, adapted from the 1998 novel by Carole Corbeil, which she performed at Toronto's Theatre Passe Muraille. In 2011 an abbreviated version of her seven-character, one-person show Hooked, written by Carolyn Smart, was part of Toronto's Summerworks Theatre Festival schedule, with performances at Theatre Passe Muraille Backspace.