Kammala jumla mai zuwa: Shekaru hudu bayan gasa a wasannin Olympics na farko, Steinegger ta cancanci shiga tawagar Austriya ta biyu, a matsayin mai shekaru 29, a wasannin Olympics na bazara na 2012 a London, ta hanyar cimma daidaitattun lokacin shigarwa na 4:41.33 a cikin
400 m mutum medley. Ta kalubalanci wasu masu iyo bakwai a zagayen na huɗu, gami da Hannah Miley na Burtaniya, da mai kare gasar Olympic Stephanie Rice ta Ostiraliya. Ta zo ne kawai a matsayi na karshe kuma na ashirin da uku a gaba ɗaya ta hanyar 0.19 na biyu a bayan Italiya Stefania Pirozzi, a waje da lokacin rikodin Austria na 4: 45.80. A nata na biyu, 200 m freestyle, Steinegger ya yi tsere a zagayen na biyu da wasu masu iyo bakwai, gami da 'yan wasan Olympics sau hudu Camelia Potec na Romania (tsohon zakara mai karewa a 2004), da Hanna-Maria Seppälä na Finland (na huɗu a wasan karshe a cikin 100 m freestyle a 2008). Ta gama ne kawai a matsayi na shida da 0.36 na biyu a bayan Katarína Filová na Slovakia a 2:02.39. Steinegger, duk da haka, ta kasa ci gaba zuwa wasan kusa da na karshe, yayin da ta sanya na ashirin da tara daga cikin 'yan wasa 37 a cikin zafin farko.