In October 2012 Mathieu announced on her Web page that she is re-releasing her "Chante Piaf", with two new recordings added, in celebration of her 50th year as a singer, and the 50th year of Piaf's death. Also that month, she had to cancel some of her shows in Russia (Rostov, Volgograd, Samara, and Ufa). She had contracted these shows through a Yekaterinburg company called Mix Art, through her Malta agent Foresa Investment Ltd. She stated that Mix Art "acted in a highly unprofessional and even fraudulent way." She was able to salvage the tours on 3 November 2012 in Moscow, 5 November 2012 in Saint Petersburg and 7 November 2012 in Krasnodar. She also performed the rescheduled concert in Ufa on 7 March 2013.