"Merata was my mentor," Gardiner said. "She had a significant influence in my journey with film, so to be able to pick up Cousins where she left it and continue her legacy, is an honour."
Gardiner has been a writer, director and producer in a number of movies that have become New Zealand favourites, including Two Cars, One Night – the first of several films she made with Taika Waititi – Tama Tū, Mokopuna, Eagle vs Shark, Boy, The Pā Boys, Waru and The Breaker Upperers.
Cousins tells the story of three cousins, Mata, who was raised by a cruel guardian who keeps her from her family; Makareta, the reluctant princess of her tribe; and Missy, who is overlooked but in the end is the glue that holds them together.
Gardiner is co-directing the movie with Briar Grace-Smith (Patricia Grace's daughter-in-law) who has written a new screenplay based on the book.
"That the story is about strong Māori women and the cast largely Māori females, has been another of the inspirations behind wanting to make this film," Gardiner said
"And, to be able to film part of it in Rotorua is awesome. For me there is a personal connection, it is my hapū and my iwi which makes it more special."
Since moving back to Whakatāne, Gardiner has always said she wanted to make films closer to where she lives as opposed to having to travel.
"It makes sense to me. Like with Taika and his connection to the East Coast. We cast from the East Coast and filmed in the East Coast – which is why we are looking for actors from Rotorua for Cousins."
Local students were observed in their classrooms by the casting crew and, if close to a character within the movie, would be recalled for an audition.