They've adapted it from British writer Sue Shield's play
Up Down Boy.
Harper's version tells the story of 19-year-old Mattie as she prepares to move out of home for the first time.
She won best emerging actor at last year's Central Regional Theatre Awards dreams of touring the play around the country, starting with Wellington.
Ultimately she wants the cast of
Shortland Street to come to see it, not only as a devoted fan of the TV series but because it was a hurtful scene from the show that made her determined to challenge stereotypes surrounding the condition.
"One particular storyline around it, it was when Zoe's character who is sister to Kate and went to Chris and said, 'hey I've got a baby with disabilities' and Chris Warner said about, 'have an abortion'.