Kammala wannan magana: Komawa zuwa Cincinnati, ta yi amfani da mafi yawan shekarun da ta rage a matsayin mai tallafawa fasaha, da kuma ayyukan sadaka da sadaka, da kuma kafa Cibiyar Harkokin Kasuwancin Mata. Sarah Peter ta zama Katolika a Roma a watan Maris, 1855, an umurce shi da Mgr Mermillod. Gidauniyar Sisters of the Good Shepherd, da Sisters of Mercy, da Little Sisters of the Poor a Cincinnati da sauran cibiyoyi sun yi yawa ga karimcinta. A 1862, ta ba da kanta a matsayin nas, kuma ta tafi tare da 'yan'uwa mata waɗanda suka bi sojojin Janar Grant a kudu maso yamma bayan da
Yaƙin Pittsburg Landing.