Returning to Poland, Lockhart began to collaborate with Milena – a young woman who she befriended in Łódź during the production of "Podwórka" and had since stayed in contact with. This collaboration resulted in the production of a series of photographs as well as the film "Antoine/Milena" (2015) in which Milena reenacts the iconic final scene from François Truffaut's "The 400 Blows". Through this collaboration, Lockhart was introduced to the residents of the Youth Center for Sociotherapy in Rudzienko, Poland – the state-run institution for girls where Milena lived. Over the course of three summers, Lockhart, together with movement therapists, philosophers, theater directors, and pedagogues, would conduct a series of generative workshops with the girls of the Center. From this collaboration Lockhart created her film "Rudzienko" (2016), which had its cinematic premiere at the 67th Berlin International Film Festival in 2017.