September 28, 1839
A daughter was born at Churchville, near Rochester, New York.
Nation and worldGrade A · 1 independent source
The evidence
“She was born at Churchville, near Eochester, N. Y., September 28, 1839. When she was two years old the Willard family moved to Oberlin.”
1908-brown-rock-county/34e-biographical-5.md, Vol. 2, PDF p. 596 / book p. 1080
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources