The Missouri Birth & Death Records (
http://s1.sos.mo.gov/records/archives/archivesdb/birthdeath/Detail.aspx?id=86002&type=Death) has an Amanda Bennett, single, 44 yrs old, born Callaway County, Mo., dying of typhoid in Liberty Township, Callaway County, 10 Oct 1885; computed date of birth is right for the sister of Madam's 2x great grandfather