I searched the Ohio census records for "Bevans". I could not locate your family in the 1850 census. Harriet's father was born in VA; her mother in PA according to the information here.
Household Record 1880 United States Census John ... SPENCE Self M Male W 46 PA Farmer PA IRE Harriet SPENCE Wife M Female W 38 OH Keeping House VA PA Emma E. SPENCE Dau S Female W 19 OH At Home PA OH Abner A. SPENCE Son S Male W 17 IL At Home PA OH Mettie N. SPENCE Dau S Female W 14 IL At Home PA OH John I. SPENCE Son S Male W 12 IL PA OH Harriet A. SPENCE Dau S Female W 9 KS PA OH Wm. C. SPENCE Son S Male W 3 KS Source Information: Census Place Delaware, Jefferson, Kansas Family History Library Film 1254383 NA Film Number T9-0383 Page Number 181C