She was born into a musical family, the youngest of four sisters all of whom became trained singers; two achieved professional fame: the eldest sister
Josepha Weber and the second eldest
Aloysia Weber. Her mother was
Cäcilia Weber (née Stamm). She moved with the family, first to Munich, then to Vienna, following the burgeoning career of Aloysia. Sophie herself sang at the
Burgtheater in the 1780–1781 season, but apparently did not make any kind of long-term success as a singer. When Mozart moved to Vienna in 1781, and lodged for a time with the Weber family, he seems to have flirted with both Sophie and Constanze (the latter of whom he eventually courted and married). The incomplete Allegro in B flat
KV 400, written by Mozart at this time, contains (in W. Dean Sutcliffe]'s words) "a self-contained melodic episode in G minor, with the names of Sophie and Costanze [
sic] Weber inscribed above a pair of prolonged sigh figures." In a letter of 15 December 1781, Mozart described Sophie as "good-natured but feather-brained." In 1782, when Mozart and Constanze were married, she was the only Weber sister who was present at the ceremony. Following Haibel’s death in 1826, Sophie moved to
Salzburg where Constanze, for the second time a widow, was living. After 1831 they were joined by their similarly widowed sister Aloysia, who died in 1839. The two younger sisters lived there together until Constanze’s death in 1842. Sophie outlived her younger nephew,
Franz Xaver Wolfgang Mozart, by two years and died in Salzburg in 1846 at age 83. ==Remembrances of Mozart==