Looking for Family of Margaretha Keller B Hesse Darmstadt and M IN St Clair CO IL

She was b. about 1847 and immigrated before she got married on 5 Aug, 1865 to Valentine Weidler Sr. b. 29 Nov 1838 in Waldfischbach, Rheinpfalz and immigrated in 1855. She had a sister who was married to Valentine before she was but I don't recall her name that died in 1864. The children of this sister were Katharina and Elisabeth.