She states father as Charles Barr, but his first wife was still alive when she was born. It is more likely that he was her step-father.
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1850 Census: Ohio, Mahoning, Youngstown
15 Oct 1850
Charles Barr, 46, male, carpenter, b. N.Y.
George W 19, male, moulder, b. Ohio
Wm 17, male, laborer, b. Ohio, attended school within the year
James 15, male, b. Ohio, attended school within the year
Jane Carlisle, 30, female, b. Ireland
Mary 8, female, b. Ohio
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1860 Census: Ohio, Mahoning, Youngstown
13 July, 1860
Charles Barr, 56, male, wagon maker, value of real estate $1000,
value of personal estate $150, b. NJ
Jane 40, female, b. IRE
Mary Eliza Geyer, 17, female, b. OH
Lina L Smith, 8/12, female, b. OH
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www.familysearch.org
Ohio County Marriages, 1789-2013
Groom: Peter Hoover
DOM: 5 Jun 1861
POM: Mahoning County, Ohio
Bride: Mary Eliza Barr
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Mahoning County Ohio Newspaper Obituary Abstracts 1843-1870
from the Canfield Weekly Herald
12 Aug 1865:
Barr, Jane--Youngstown, 10 Aug, 46 y, b. near Belfast Ire., to Youngstown as a child, leaves husband Charles and an only dau, cancer of face
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Mahoning County, Ohio Probate Records: Cases Probated between
13 Jan 1857- and 31 Dec 1867
compiled by Dawn W Bailey
Mahoning County Genealogical Society
Closson Press
Apollo, PA
2002
page 82
1168: Barr, Jane O
Will: 5 June 1865 Youngstown Twp
Probate: 7 Sep 1865
Witnesses: L.D. Woodworth, John Weeks
Executor: Charles Barr [widower] deceased owned land
Heir: Mary E. Hoover [of Poland Twp]*
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1870 Census: Ohio, Mahoning, Poland Twp, Lowellville P.O.
Hoover, Peter, 46, farmer, b. PA
Mary, 28, keeping house, b. OH
Levi L, 11, b. OH
Charles, 8, b. OH
Ida, 6, b. OH
Elizabeth E, 4, b. OH
Hannah, 2, b. OH
James, 4/12, b. OH (Mar)
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1880 Census: Michigan, Gratiot, Elba
Hoover, Petter, 56, farmer, b. PA, PA, PA
Mary E, 38, keeping house, b. OH, OH, IRE
Charles, 18, works at home, b. OH, PA, OH
Ida J, 15, works at home, b. OH, PA, OH
Elizabeth, 14, b. OH, PA, OH
Ella M, 12, b. OH, PA, OH
James G, 10, at home, b. OH, PA, OH
Ira P, 8, b. OH, PA, OH
Cynthia M, 5, b. OH, PA, OH
Lorence L, 3, b. OH, PA, OH
Alice L, 1, b. MI, PA, OH
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1900 Census: Michigan, Gratiot, Elba (15 June)
Hoover, Charles B, b. Mar 1862, 38, married 5 yrs, b. OH, PA, OH,
farmer
Sarah C, b. Mar 1865, 35, married 5 yrs, mother of 2
children, 2 children living, b. MI, ENG, MI
Foster B, son, b. Oct 1896, 3, b. MI, OH, MI
Hucott C, son, b. Oct 1899, 7/12, b. MI, OH, MI
Mary E, mother, b. Jun 1842, 57, wid, mother of 13 children,
11 children living, b. OH, NY, IRE
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www.familysearch.org
Michigan Deaths and Burials, 1800-1995
Name: Mary E. Hoover
DOD: 4 May 1905
POD: Elba, Gratiot, MI
Age: 62
DOB: 1943
POB: Ohio
Occupation: Housekeeper
Marital Status: Widowed
Father: George Barr (step-father: Charles Barr)
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http://seekingmichigan.org/discover
Michigan death certificate has her transcribed as "Hoober"