N'egwuregwu Olimpik nke afọ 2012 na London, Hardy nwetara ihe nrite Olimpik mbụ ya, ọla nchara, n'ọsọ ọsọ 4×100 mita n'egwuregwu nnwere onwe ya na Missy Franklin, Lia Neal na Allison Schmitt, mgbe ndị otu US kwụsịrị nke atọ n'azụ ndị otu si Australia na Netherlands. Na-egwu mmiri na ụkwụ nke abụọ, Hardy nwere nkewa nke 53.53 sekọnd na ndị otu gwụchara na ngụkọta oge nke 3:34.24, ihe ndekọ America. O nwetakwara ihe nrite ọlaedo site n'isoro ndị otu meriri nke United States na-egwu mmiri n'asọmpi nke mbụ nke ịgba ọsọ 4×100 mita. N'asọmpi abụọ ọ gbara n'otu n'otu, ọ gbara onye nke asaa n'ọsọ mita iri ise
nakwa nke asatọ na 100 mita freestyle.