Hilarious and heartwarming stories from Mattie's childhood are interlaced with songs, dances and drama skits as the audience gets the opportunity to enter the wild and colourful imagination of Mattie and, by extension, Lily herself.
Lily met producer and director Nathan Mudge when he started running the performance company for people with intellectual disabilities that she is part of.
The pair quickly built a good rapport so it wasn't long before they started planning a show that would give Lily the chance to shine.
"As soon as we met, I was instantly caught by her unique perspective of the world and natural talent for performing," says Mudge.
"She has an incredibly positive attitude towards life that is so joyous to be around, and I can't wait to share that with everyone who comes to the show."
With Harper and Mudge, award-winning actor Trudy Pearson takes on the role of Mattie's mother.
Michiel van Echten co-directs and features as one of Harper's imaginary friends, along with Mycah Keall who is in her final year of a Performing Arts degree at Te Auaha in Wellington.
Professional designers Ian Harman and Natala Gwiazdzinski are also on board.
The show will be fully accessible to the Manawatū disability community, the first of its kind in the region.
There will be a relaxed performance on Friday February 28 for those who will benefit from a more relaxed performance environment, including people with an Autism Spectrum Condition, sensory and communication disorders or a learning difficulty.
There will be a fully accessible performance with audio description and sign interpretation on Sunday March 1 for those who are blind or low vision, or deaf or hard of hearing.
"Theatre is for everyone," Mudge reminds us.
"I hope Up Down Girl inspires venues and producers to make a conscious effort to include people with mixed abilities, on stage and off."
Up Down Girl plays from February 28 to March 1 at The Globe Theatre, 312 Main St.
For more information and to book, visit globetheatre.co.nz
People with accessibility requirements should contact The Globe Theatre directly.