According to the book 'A Dowling Family of the South'
"Zillih was living with son Wesley at the time of her death May 7, 1898. She was buried beside her husband, Samuel H. Hallford, in Claybank Cemetery. He had died on October 28, 1864, ten days after his fifty-eighth birthday. His last illness had begun on that birthday!"
More information on this family is available in this book. Let me know if you need it. You can email me using the link at the bottom of any page on my website (below).
Walter Dowling Wood
http://mywoodfamily.us