Most of what is known of Dora’s early life is described in the biographies of her parents, which you are encouraged to read, but the main points are as follows:
Dora was the second eldest daughter of George and Nancy Jane Runyan. She was born in Cocke County, Tennessee, in February, 1863, seven months before her father went to war. In 1871, when Dora was age 8, the family moved to Arkansas and lived along the upper tributaries of the White River. At times they would visit their Runyan and Mantooth relatives downriver in Oil Trough, near Newport. In 1874, her second cousin Lawson Mantooth Jr. had married Sarah Bollinger, and Dora became acquainted with Sarah’s brother, Harden Hulsey Bollinger. They in turn were married in 1879 and lived in Oil Trough, close to Lawson and Sarah (Bollinger) Mantooth, next door to Lawson’s brother Lewis Mantooth and his wife Emily, and not far from the family of Joseph Manning Runyan, who was her father’s cousin and war buddy. While living in Oil Trough, Dora gave birth to four children:

Cora Belle Bollinger (1882 – 1975)
Ora Lee Bollinger (1885 – 1965)
Joseph Solomon "Joe" Bollinger (1886 – 1960)
Pearl May L. Bollinger (1890 – 1964)

In 1891, Dora’s parents decided to migrate to Indian Territory, and Dora and her family joined them. They might first have lived on the same farm as her parents, in what was later Byars, McClain County, but by 1900 they had their own farm several miles east from there, at Township 4N.R4E. This was in the northwest of Pontotoc County, just east of McGee/Stratford on the way to the town of Ada. According to John Larimore, they spent time in Ada and recommended the place to his grandfather, Dr. John Runyan, who was Dora’s second cousin. He had been practicing medicine in Johnsonville but was engaged to be married and wanted a larger town for his wife’s sake. He was married in 1901, and they settled in Ada.

Dora and Harden had four more children while they were living in Indian Territory:

Mary Frances Bollinger (1892 – 1972)
Ethel Naomi Bollinger (1894 – 1979)
John J Bollinger (1898 – 1965)
Beulah Estelle Bollinger (1900 – 1991)

At that time tuberculosis was endemic, in part because people didn’t know it was contagious, and in part because there was no treatment for it. After giving birth to her last child, Dora came down with tuberculosis. The family moved to Johnsonville, where her sisters helped with the children, and where Dr. Runyan attended to her. Her husband Harden managed a general store, almost certainly the one belonging to Dora’s brother-in-law and second cousin, WT Mantooth. As Dora’s health declined, she entrusted her baby Beulah to the care of her sister Docia Brown, who took care of her for several years, until she was old enough for Harden to take her back. Her sisters Oma and Lillie Mae took care of younger children as well, including Pearl, who lived with Lillie Mae until she was an adult.

Dora died in the last week of June, 1902. Her husband Harden never remarried but raised the remaining children himself. The 1910 census shows him working as a farmer near Johnsonville, with his three youngest children living with him: Ethel 15, John 11, and Beulah, 9. When Harden got too old to farm, his daughter Ethel (Bollinger) Leachman accepted both him and the two youngest children, John and Beulah, into her family’s home on Towne Avenue in Los Angeles, where they are found in the 1920 census. When the children were grown, they went their different ways. Cora moved to Texas, while Joseph, Pearl, Ethel, and Beulah moved to California. John returned to Oklahoma. Those who remained in Oklahoma moved to larger cities. The 1930 census finds Harden, age 83, living on his own in Byars, near the homes of Dora’s brother Alonzo and sister Oma. He passed away in June of that year and was buried next to his wife Dora, beneath two cedar trees.

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Death announcement in The Daily Ardmoreite, Wednesday, July 2, 1902, p.2 :
Johnson
Mrs. Dora Bollinger died of consumption last week, after a lingering illness.

Note: The marker is next to that of her husband, but it makes on obvious error in misspelling her surname and saying she died in 1800.