Ramba uchiverenga ndima iyi - Pamakwikwi eOlympic a2012 muLondon, akaputsa zvakare rekodhi yake yekuAmerica uye akaisa rekodhi yeOlympic nenguva yemasekonzi 56,25 pakumhanya bhatafurayi kwemamita 100
kupisa kwakakodzera. Mumakwikwi okupedzisira emamita 100, akahwina menduru yegoridhe ndokuisa rekodhi itsva yenyika nenguva yake ye55.98. Vollmer akakwikwidzawo mumakwikwi e4 × 200-metre freestyle relay. Akashambira muchikamu chechipiri nenguva ya1:56.02, sezvo chikwata cheU.S. chakahwina ndarama nenguva ya7:42.92. Mumutambo wake wokupedzisira, 4×100-metre medley relay, Vollmer akakunda imwe ndarama naMissy Franklin, Rebecca Soni naAllison Schmitt. Achishambira netsoka yemabhururu, Vollmer akarekodha nguva yakakamurwa ye55.48, sezvo timu yeU.S. yakaisa rekodhi yenyika itsva nenguva ye3: 52.05, ichivandudza rekodhi yapfuura ye3: 52.19 yakagadzwa neChina muna2009.