She graduated with honours from the Academy of Music in Gdańsk where she was taught by Halina Mickiewiczówna - a student of Ada Sari. Kucharska-Szefler is a laureate of the international competition of A. Dvořák (2nd award in 1984) as well as Polish national competitions of S. Moniuszko (3rd award in 1984) and Ada Sari (1st place and special award for the performance of the Polish song in 1985). In her repertoire, there are opera and oratorio parts as well as chamber music, songs and pieces of early music.

From 1990 to 1995, she was a soloist in the Baltic Opera where she performed the parts of Liu in Turandot, Micaela in Carmen, Zofia in Halka and Hanna in the Haunted Manor She also appeared as Valencienne in the Merry Widow and Saffi in the Gypsy Baron. She created the title role in the Polish first performance of the concert opera Genoveva by Schumann in the Baltic Philharmonic in 1991. As a chamber musician, she toured Western Europe with the early music group called “Cappella Gedanensis.” 

Aleksandra Kucharska-Szefler recorded the songs and ballads of Stanisław Moniuszko for the Polish Radio. She is an esteemed promoter of Kashubian composers and recorded their works for the radio and TV. Her CDs include: Requiem Piaśnickie by Andrzej Nanowski (2002) and Mòrze - songs from Northern Kashubia (2004). In 2008, she recorded vocal, French horn and grand piano versions of Pieśni koncertowe Romantyzmu [Eng. Concert Songs of Romanticism]. Kucharska-Szefler is a Ph.D. in Music Arts. She teaches singing at the Department of Vocal and Acting Arts of the Academy of Music in Gdańsk.