This is the tombstone of Christena Magdalena (Ehret) Huber, located in row 9 of Zion Lutheran Cemetery, Schumm, Van Wert County, Ohio. The marker is inscribed:
July 4, 1880
Aged 66 Y, 10 M, 2 D
Christena Magdalena Ehret was born 21 September 1813 in Markgroeningen, Oberamt Ludwigsburg, Wuerttemberg, the daughter of Johann Adam Ehret and Christina Magdalena Gerna/Gerne/Grona.   As calculated from her tombstone and as written in Zion Schumm’s records, her date of birth would be 2 September 1813, but I would consider the date in the old German church records as the most accurate.
Christena Ehret and Michael Huber married 7 September 1841 in Markgroeningen. 
Michael Huber was born 30 May 1816 in Schwieberdingen, Wuerttemberg, the son of Balthas Huber (1777-1862) and Anna Maria (Mayle) Huber (1783-1829). 
A daughter, Caroline Huber, was born to Michael and Christena Huber on 10 June 1842 in Wuerttemberg.  
Michael Huber, wife Christena, and daughter Caroline immigrated to America in June 1853. 
In 1860 the Michael Huber family lived in Blackcreek Township, Mercer County, and had a Shanes Crossing address. The family in 1860: Michael Huber, 44; Christena Huber, 46; Caroline Huber, 18. All three family members were born in Wuerttemberg and Michael was a farmer. 
The Michael Huber family in 1870, residing in Blackcreek Township: Michael Huber, 54; Christena M Huber, 57; Caroline Huber, 28; and Flora Laukhart, 6, [granddaughter]. Flora was the daughter of Caroline Huber and Casimere B. Laukhart (1818-1879). All three Hubers were born in Wuerttemberg and Flora was born in Ohio. 
Michael Huber died 29 March 1877 and was buried in row 9 of Zion Schumm’s cemetery. 
In 1880 Christena Huber, 70, widow, lived with her daughter Caroline [Huber], 36, divorced, and granddaughter Flora Laukhart, 11. This enumeration indicates that Christena and Caroline were born in Bavaria and that Flora was born in Ohio. The enumeration also indicates that Christena had cancer of the uterus, which I believe is an unusual thing to mention in the census. 
That 1880 census was taken in Willshire Township on 25 June 1880 and Christena (Ehret) Huber died less than 2 weeks later, on 4 July 1880. Zion Schumm’s records indicate she died of a prolonged illness and was 66 years, 10 months, and 2 days old. She was buried on the 5th.
 Note by kmb: I translated these surnames the best I could but I am still uncertain of the actual spelling of some.
 Wuerttemberg, Germany, Lutheran Baptisms, Marriages, and Burials, 1500-1985, Markgroeningen, Taufen & Heiraten 1703-1933, year 1841 no.21, Michael Huber & Christina Madgalene Ehret, married 7 Sep 1841; online database, Ancestry.com, viewed 6 Mar 2022.
 Wuerttemberg, Germany, Lutheran Baptisms, Marriages, and Burials, 1500-1985, Schwieberdingen Taufen, Tote, Heiraten, Notizen & Toten, 1558-1810, year 1842 no.42, Karolina Huber, born 10 Jun 1842.
 Wuerttemberg, Germany, Family Tables, 1550-1985, Schwieberdingen, Konfirmation & Familienbucher, 1723-1866, p. 182, Michael Huber family; online database, Ancestry.com, viewed 6 Mary 2022.
 1860 U.S. Census, Black Creek, Mercer, Ohio, p.329, dwelling 581, family 586, Michael Huber; digital image by subscription, Ancestry.com, viewed 6 Mar 2022.
 1870 U.S. Census, Black Creek, Mercer, Ohio, p.23A, dwelling & family 62, Michael Hoober; digital image by subscription, Ancestry.com, viewed 6 Mar 2022.
 Ohio, County Death Records, 1840-2001, Van Wert, Vol.1, 1867-1908, p.120 Michael Huber, 29 Mar 1877; database with images, FamilySearch.org, viewed 6 Mar 2022.
 1880 U.S. Census Willshire, Van Wert, Ohio, ED 154, p.457A, family 258, Mary Hoser; digital image by subscription, Ancestry.com, viewed 6 Mar 2022.