I'm no pro, just been at it for a while, too. Most of my roots are in Highland and I have some of the books of records. Deaths were recorded from 1867-1908 at Probate Courts, too, but I did not see one Bradfield in them. The cemetery book has no Bradfield nor do the Probate Court records. There were a few marriages in the 1820's and your Sarah in 1876. A Joseph in 1820 and Elias in 1830were the only ones on the any census 1820-1900. “The Encyclopedia of Quaker Genealogy, 1750-1930”, by Wm. W. Hinshaw Vol. 5, page 224 does show Sarah Catherine Bradfield being received by request at Fairfield MM near Leesburg on 19 Feb 1870. A few other Bradfield names in Hinshaw mostly in the 1820-1840 time frame.