Ku dhameystir weedhan soo socota: Ciyaaraha Olombikada ee 2012 ee London, waxay mar kale jabisay rikoodhkeedii Mareykanka waxayna samaysay rikoodh Olombikada iyadoo ku guuleysatay 56.25 ilbiriqsi heerka u qalmitaanka 100 mitir. 100 mitir oo dabacsan oo finalka ah, waxay ku guuleysatay billad dahab ah waxayna sameysay rikoor cusub oo adduunka ah iyada oo leh waqti 55.98. Vollmer wuxuu sidoo kale ku tartamay
4 x 200 mitir oo isugu jira dabaasha iyo dabaasha. Waxay dabaashay lugta labaad iyada oo leh waqti 1:56.02, maadaama kooxda Mareykanka ay ku guuleysatay dahabka iyada oo leh waqti 7:42.92. Dhacdadii ugu dambeysay, 4 × 100 mitir oo isku dhafan, Vollmer waxay ku guuleysatay dahab kale Missy Franklin, Rebecca Soni iyo Allison Schmitt. Vollmer ayaa ku dabaashay lugta balanbaalis, Vollmer wuxuu diiwaan geliyey waqti kala duwan oo ah 55.48, maadaama kooxda Mareykanka ay sameysay rikoor cusub oo adduunka ah oo leh waqti ah 3:52.05, taasoo ka wanaagsan rikoorkii hore ee 3:52.19 ee ay samaysay Shiinaha sanadkii 2009.