She graduated from King John III Sobieski Secondary School and the Ludwik Solski Academy, both in Kraków. Since 1987, she has been an actress of Kraków's Old Theatre. She has also worked at the National Theatre in Warsaw. Her theatrical career includes Albertine's role in the Operetka by Witold Gombrowicz, directed by Tadeusz Bradecki in the Old Theatre (1988). She was also Salome in Sen srebrny Salomei (Stary Theater, 1993), Marguerite in Faust by Johann Wolfgang Goethe (Stary Theater, 1997) and Rachela in Stanisław Wyspiański's Wesele (National Theatre, 2000).
She has twice won the prize granted by the editors of the Polish theater magazine, Teatr - in the 1992/1993 season, for the role of Salome and in the 1996/1997 season, for the role of Margaret in Faust.
Her popularity gained her film and television roles, including title role in the films Faustyna as well as roles in film, Tato and the show, Na dobre i na złe (For Better And For Worse). In the Polish dub of the films Harry Potter and the Order of the Phoenix and Harry Potter and the Half-Blood Prince, Segda voiced the character of Bellatrix Lestrange, played by Helena Bonham Carter. In 2009, she starred in the TV series Naznaczony (Appointed) as a fencing coach Eve (Episode 8).
Since 2001 her husband is Polish theater director, screenwriter and composer Stanisław Radwan.
She provided voices to four Disney movies.
- She is the granddaughter of Władysław Segda, double Olympic bronze medalist in fencing.