Mezue ahịrịokwu a: N'egwuregwu Olimpik nke afọ 2012 e mere na Lọndọn, ọ gbajiri ihe ndekọ Amerịka ya ọzọ ma setịpụkwa ihe ndekọ Olimpik n'oge ọ gbara sekọnd iri ise na isii na nkeji iri abụọ na ise n'oge ọ gbara ọsọ otu narị mita n'elu mmiri. N'asọmpi ngwụcha nke 100 mita butterfly, o nwetara ihe nrite ọlaedo ma setịpụ ihe ndekọ ụwa ọhụrụ na oge ya nke 55.98. Vollmer sokwa n'asọmpi ahụ.
4×200-meter freestyle relay. Ọ gbara ọsọ nke abụọ na oge nke 1:56.02, ebe ndị otu United States meriri ọlaedo na oge nke 7:42.92. N'ihe omume ikpeazụ ya, 4 × 100 mita medley relay, Vollmer meriri ọla edo ọzọ na Missy Franklin, Rebecca Soni na Allison Schmitt. Na-egwu mmiri n'ụkwụ urukurubụba, Vollmer dere oge nke 55.48, dịka ndị otu US setịpụrụ ndekọ ụwa ọhụrụ na oge nke 3:52.05, na-eme ka ndekọ oge gara aga nke 3:52.19 nke China setịpụrụ na 2009.