Prior to her participation in Miss Polonia, Mancewicz was the official representative of her country to the 2005 Miss Tourism Queen International pageant held in Hangzhou, where she placed third runner-up to eventual winner, Nikoletta Ralli of Greece.[4]
Miss Polonia 2010
Mancewicz, who stands 1.75 m (5 ft 9 in) tall, competed as one of 18 finalists in her country's national beauty pageant, Miss Polonia,[5] held in Łódź on 11 December 2010, where she obtained the Miss Internet award and became the eventual winner of the title, gaining the right to represent Poland in Miss Universe 2011.[2]