She is the daughter of Thomas William Sivells 1773-1867 and Elizabeth Williams 1779-1855.
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The Cadiz Record obit posted 19 Jan 1905 reads as follows:

Good Lady Passes Away At a Ripe Old Age Last Thursday.
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Mother of Dr. W C Cunningham Called to Her Reward - Was a Daughter of the Revolution

Mrs. Bettie Sivills Cunningham died at the home of her son, Dr. W C Cunningham, in this city, last Thursday night of the infirmities of old age.

Mrs. Cunningham was born in Trigg County, where she had lived all her life, and would have been ninety years old the 23rd of next April. She was the widow of the late Mickins Cunningham, who preceded her to the grave over sixteen years. She was the last of a number of brothers and sisters to depart this life, and was a Daughter of Revolution. Her father, Thos. Sivills, fought through the Revolutionary War, and was in the battle of New Orleans.

She was married in 1832 to Mickins Cunningham, and to that union nine children were born, four of whom survive her. They are R W Cunningham, Dr. W C Cunningham, Mrs. C T Hendrick, and Mrs. Missourin Hendrick, all of this county.

In 1836 she professed faith in Christ and united with the Baptist Church at a school house on Hurricane Creek, and was one of the charter members of the old Hurricane Baptist Church, and lived a consecrated member of the church until the end. She had fought a good fight, had kept the faith, and closed her eyes on earth in peace with all mankind and with her Master.

She leaves four children, forty-nine grandchildren, eighty-nine great grandchildren, and six great great grandchildren. She had seen seven generations, which can be said by a few.

Her remains were laid to rest last Friday afternoon in the old family graveyard on Hurricane Creek, amid a large crowd of sorrowing relatives and friends.

*obit transcribed as written*