Childbirth caused severe respiratory problems for Sophie, which progressively weakened her, although she managed to recover. However, a year later she contracted a severe case of influenza that she could not overcome. Sophie died shortly before her 22nd birthday on 9 March 1867 and was interred at Tegernsee Abbey.
Bestenreiner, Erika (2003). Sisi und ihre Geschwister [Sisi and her siblings] (in German) (2nd ed.). Munich: Piper. ISBN3-492-24006-2.
Bestenreiner, Erika. The Empress Sissi. Milan, Mondadori, 2003.
Graf, Bernhard (2017). Sisis Geschwister [Sisi's siblings] (in German). Munich: Allitera. ISBN978-3-86906-977-7.
von Witzleben, Hermann; von Vignau, Ilka (1976). Die Herzöge in Bayern. Von der Pfalz zum Tegernsee [The dukes in Bavaria. From the Palatinate to Tegernsee] (in German). Munich. ISBN3-7913-0394-5.{{cite book}}: CS1 maint: location missing publisher (link)