Mahnert returned to her native Switzerland, where she worked in distribution and programming at 20th Century Fox, Warner Bros., Pathé Cinémas, and Frenetic Films.
[3] In March 2020, Mahnert became the executive director at the Frontières Co-Production Market, an industry initiative for genre film professionals.
She is a consultant for the Zurich Film Foundation, the Cineforom in Geneva, and co-founded the European Genre Forum.
[4] As a film producer, she worked on Mattie Do's The Long Walk (2019),[5] Alexandre O. Philippe's documentaries 78/52: Hitchcock's Shower Scene (2017) and Memory: The Origins of Alien (2019), and other productions.
In 2022, she was selected as jury member in the "Filmmakers of the Present" competition category at 75th Locarno Film Festival.