She studied at Wrocław Academy of Music, graduating with honours in choral conducting from the Musical Education Department (2004) and in singing from the Vocal Department (2006). She then took up postgraduate studies for choirmasters at the Academy of Music in Bydgoszcz. She had also studied biology at Wrocław University (2000). She began her career in choral music as a member of the Mixed Choir of the Grammar School in Głubczyce. In 1993–99 she was a member of the Polish-German Choral Academy “In Terra Pax”, where in 1997–99 she acted as voice instructor. In 1999 she founded the Con Amore Choir of School Complex No. 1 in Wrocław, with which she won honourable mentions at the National Choral Competition in Bydgoszcz (2000, 2001). In 2000 she initiated the Chamber Choir of the Medical Academy in Wrocław, with which she continues to score numerous successes in competitions in Poland and abroad. Since June 2006, she has held the post of artistic director of Wrocław Philharmonic Choir.
She has appeared as choirmaster and guest conductor with ensembles such as Silesian Philharmonic Choir, Gabrieli Consort, Wrocław Philharmonic Symphony Orchestra, Ricordanza Wrocław Soloists’ Ensemble, Chamber Orchestra of the Wrocław Music Academy, Wratislavia Cantans Festival Choir, Chor der Bamberger Symphoniker, Schleswig-Holstein Festival Choir. She has received several awards in choral and conducting competitions: 1st Prize and two Special Awards at the National Choirmasters Competition Poznań (2004), Legnica Cantat National Choral Competition (2004, 2006, 2008, 2010) and Gaude Cantem International Choral Festival (2006, 2010). For her outstanding contribution to the artistic development of Wrocław Philharmonic Choir and the Chamber Choir of the Medical Academy in Wrocław, she was granted the Wrocław City Music Award in 2010. In January 2012 she was accorded the title of the Man of the Year 2011 in the category of culture by users of the web portal tuWroclaw.com.
Apart from her choral work, Agnieszka Franków-Żelazny has also been engaged in teaching activities. As an assistant professor with a Doctor of Arts degree on the faculty of the Academy of Music in Wrocław (Musical Education Dept.), she teaches a conducting class and directs the Stanisław Krukowski Choir. She has also taken part in numerous conducting seminars and courses and is frequently invited as vocal consultant to conduct workshops for choirmasters and choral ensembles.