Kammala jumla mai zuwa: A Wasannin Olympics na 2012, Elmslie ya wakilci tawagar 'yan wasan Australia da suka lashe lambar zinare (tare da Cate Campbell, Alicia Coutts da Melanie Schlanger a wasan karshe) na 4 × 100 mita mai kyauta, inda kungiyar ta kafa rikodin Olympic na 3:33.15. Elmslie kuma ya lashe azurfa biyu, a matsayin wani ɓangare na ƙungiyoyin Ostiraliya a cikin gasa mai zafi na duka 4 × 100 mita medley relay da
4 × 200 mita kyauta kyauta.