In the film Maimie plays Gemma, Greg Kielty's partner.
She said: "They have a new baby so they're in the early stages of parenthood. Gemma is super capable and is the driving force in their family, but we meet her at the end of her tether with Greg.
"She loves him greatly but she can't carry on with him in this way."
Asked how she got involved in the film, she replied: "Most of us were all friends with Craig and he thought I'd be a good fit for Gemma. It's always lovely to have familiarity with each other especially when playing a couple. You have an instant shorthand."