Look-up, please, early cemetery/death records

Is there someone who can do a look-up in any records you may have for Mary "Polly" Vian Downs.She died between 1852 (when her last child was born in Blackcreek Twp., Mercer Co.) and 1860 (when her widowed huband and children were found in Missouri).Her brother, Jeremiah Vian, was buried in Pleasant Grove Cemetery, and I thought perhaps she might be there, or some nearby burying ground.Thanks!