Bennett Andrew's dying request (through his will probated in Guilford County, North Carolina in 1819) was that his wife Mary Leah Dillon Andrew remove herself to a free state. In 1819, mother Mary Leah Dillon Andrew (accompanied by her children, a muley cow, and her mother-in-law, Mary Montgomery Andrew) headed west to Fredericksburg, Blue River Township, Washington County, Indiana.
-Guilford County, North Carolina Will and Probate records, and the records of Edna Hornor Byrne of Fredericksburg, Indiana (courtesy of Teresa Reif).
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From Samuel Hornor and Mary Leah "Polly" Andrews Bible
Newspaper obituary (No name or date):
Deaths
ANDREW--Mrs. Sarah [the name Sarah has been crossed out and Leah Andrew written in] Andrew, near Greenville, Ind., February 25th. She was born in Guilford, North Carolina, June 9, 1788. She became a member of the Church in her seventeenth or eighteenth year. She removed to Indiana in 1819, and settled on Blue River near Fredericksburg, in Washington County. She was the widow of Rev. Bennett Andrew, of the North Carolina Conference, who died May 28, 1819 his dying request to wife and children being remove to a free State. Ever after her espouse to the Church she remained a faithful member until the day of her death.-----
From Teresa Reif:
Bennett died in Tennessee and the widow came on to Indiana. In 1818 she (Mary Leah Dillon Andrew) made her home with the Jacob Horner family. Supposedly, she married Seth Zimmerman Horner 1 September 1829. ["Leah" would have been forty-one years old at the time of her marriage to Seth; 1 Sept. 1829 is the date that Leah's daughter Mary Leah "Polly" Andrew married Samuel Horner.]
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1820 U. S. Federal Census, Washington County, Indiana
p. 219 [Ancestry.com Images Online, image 19]
line 34: Daniel Dillin; 2 males to 10 yrs.; 1 male 26-45; 2 females to 10; 1 female 26-45; 1 person engaged in agriculture
line 35: Leah Andrew; 2 males to 10 yrs.; 1 male 10-16; 1 female to 10; 2 females 10-16; 1 female 26-45; 1 person engaged in agriculture
p. 221 [Ancestry.com Images Online, image 21]
line 15: William Horner; 1 male 16-26 yrs.; 1 female 16-26
line 16: Jacob Horner; 1 male 10-16 yrs.; 1 male 16-18; 3 males 16-26; 1 male 45 &c.; 2 females to 10; 1 female 16-26; 1 female 26-45
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1830 U.S. Federal Census, Washington County, Indiana
p. 299 [Ancestry.com Images Online, image 39]
line 8: William Horner; 1 male 5-10 yrs., 1 male 15-20; 1 female 10-15; 1 female 30-40
line 9: Leah Andrew; 1 male 10-15 yrs.; 1 male 15-20; 1 female 10-15; 1 female 30-40
line 10: John McPheters
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1840 U. S. Federal Census, Posey Township, Washington County, Indiana:
Travis Andrew [Ancestry.com Images Online, image 5]
William Andrew [Ancestry.com Images Online, image 5]
Thomas Andrew [Ancestry.com Images Online, image 7]