Pedzisa mashoko anotevera: Pamitambo yeOlympic yeZhizha ya2012 muLondon, akaputsa zvakare rekodhi yake yokuAmerica uye akaisa rekodhi yeOlympic nenguva yemasekonzi 56,25 mumakwikwi ake okutanga emamita 100 achishandisa butterfly. Mumakwikwi okupedzisira emamita 100, akahwina menduru yegoridhe ndokuisa rekodhi itsva yenyika nenguva yake ye55.98. Vollmer akakwikwidzawo mu
4×200-mita 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.