Tuhia he tomokanga mo tenei pene - I whanau ia i Richboro, Pennsylvania, te tamahine a Charles Tyson Heston, he kaihanga rongoā, me Elizabeth Sagers. I whiwhi a Rorer i tana maatauranga tuatahi i East Aurora, New York, a i whakaakona ia ki te tunu kai i te New Century School of Cookery, Philadelphia. Whai muri i tana whakaoti kura, ka noho ia hei kaiako tunu kai me te kai totika i te Karapu Tau Hou. I te tau 1884 i whakatuhia e ia te Kura Kaakahu o Philadelphia. I roto i tana mahi, he maha nga whakaaturanga tunu kai a Mrs. Rorer, ko etahi o ratou i Pennsylvania Chautauqua. Ko ia te Perehitini o te poari awhina wahine o te Pennsylvania Chautauqua. Ko ana whakaaturanga rongonui i te St. Louis World's Fair o 1904
, i reira ia te kaiwhakahaere me te kaiwhakahaere o te rawhiti me te uru pavilions.