Thank you. I don't recognize the name Barnett Brightwell, but I'll keep it mind.
Further information on Mary Brightwell from family search:
Mary F. BRIGHTWELL (AFN: 1NQM-MMH) Birth:1842, Woodford, Kentucky Father: Waller L. BRIGHTWELL (AFN: 1NQM-MCT) Mother:Permelia MITCHELL (AFN: 1NQM-MD2)
According to http://www.surnames.com/burgess/oliver.htmhttp://www.surnames.com/burgess/oliver.htm "Granville Jackson 3 Oliver (John 2, Josiah 1) was born Oct 23, 1823 in Farquier County, VA, and died May 14, 1884. Lived near Hickory Grove, Platte County, MO.He married Eliza Elender Brightwell Feb 10, 1853, daughter of Waller Brightwell and Permilia Mitchell." That source also says that they had three daughters: Fannie Oliver, Mattie Oliver, and Sallie Oliver.
So, Eliza Brightwell is an elder sister of Mary F. E. Brightwell.