Viola Slentz can be found in the 1880 Penn Twp, Jay County, Indiana census under "Shentz" (at least that's how it appears on the Familysearch site) along with her older brother Eli, sister Ella and younger sister Alice. Mother Mary Rigby Slentz appears to have married my 2greatgrandfather Charles Dority after being widowed in October 1867 when her husband Noah M. died. Viola is also in the 1870 Jackson Twp (Trenton), Blackford County census along with the aforementioned siblings (except Ella is called Plumy) and older siblings Ephram, James W., Daniel, Noah and Minerva. Noah (the father) and possibly another daughter Lucinda (d. 11 October 1859 aged 4y7m11d and listed as daughter of N and M Slentz) are buried in Hillside/Quaker cemetary near Pennville. Rootsweb lists Noah M. Slentz as b. 17 June 1824 and an older sibling Martha is also shown. Hope this helps!
I could use some help myself pinning down whether this Charles Dority is my 2 greatgrandpa.