Kammala wannan jumla: A Wasannin Olympics na 2012 a London, Joyce ya rubuta lokaci 25.28 seconds a Heat 8 na
50 mita freestyle, tilasta ta cikin wani iyo-off da biyu sauran fafatawa a gasa ga goma sha shida da kuma karshe wuri a cikin 50 mita Semi-finals. Ta hanyar ƙarfafawa daga masu sauraron gida, dan takarar Birtaniya Amy Smith ya lashe gasar tare da lokacin 24.82, ya kawo karshen halartar Joyce a cikin taron.