Head of the Household Heinrich Kaltenberger, age 60 in 1850, deceased 1853.
Child #1 Johann Adam Kaltenberger, age 50
Wife of Child #1 Katharina Kaltenberger, age 50
Grandchild #1 Georg Jakob Kaltenberger, age 25
Grandchild #2 Christian Jakob Kaltenberger, age 23
Wife of Grandchild #2 Katharina Margaretha Kaltenberger, age 23
Great Grandchild #1 Friedrich Jakob Kaltenberger, age 2
Grandchild #3 Christina Margaretha Kaltenberger, age 17
Grandchild #4 Louisa Kaltenberger, age 15
Grandchild #5 Konrad Kaltenberger, age 4 in 1850, deceased 1854
Child #2 Heinrich Kaltenberger, age 33 in 1850, to Rosenberg in 1852
Grandchild #6 Christian Jakob Kaltenberger, age 10 in 1850, to Rosenberg in 1852
Grandchild #7 Georg Jakob Kaltenberger, age 6 in 1850, to Rosenberg in 1852
Grandchild #8 Heinrich Jakob Kaltenberger, age missing from 1850 census, to Rosenberg in 1852
Child #3 Georg Jakob Kaltenberger, age 31 in 1850, to Unterdorf in 1852
Grandchild #9 Georg Jakob Kaltenberger, age 31 [sic] in 1850, to Unterdorf in 1852
Grandchild #10 Philipp Kaltenberger, age 6 in 1850, to Unterdorf in 1852
Child #4 Johann Philipp Kaltenberger, age 26 in 1850, to Unterdorf in 1852
Child #5 Konrad Kaltenberger, age 28
Wife of Child #5 Katharina Margaretha Kaltenberger, age 26
Grandchild #11 Johann Jakob Kaltenberger, age 6
Grandchild #12 Anna Barbara Kaltenberger, age 4
Grandchild #13 Johann Jakob Kaltenberger, age 1 year 6 months
Child #6 Johann Jakob Kaltenberger, age 28
Anna Margaretha is not listed in the 1857 census. She would have been 69 years old that year. It's possible that after the death of her husband in 1853, when she would have been only 65, she remarried and moved to her new husband's household, all by 1857. All her children were grown, so there was no pressing reason for her to remain in what would be household #15 in the 1857 census. That said, however, it is also entirely possible that she had died, either before or after the death of her husband. The third cholera pandemic swept across Russian between 1850 and 1860, killing more than 1 million Russians.
It's quite possible that both her death and that of her husband were due to cholera.
Anna Margaretha was 46 years old at the time of the 1834 census. This gives her a birth year of about 1788. The following women in the 1798 census were named Anna Margaretha and were born in or around 1788:
Family #13 Anna Margaretha Kerbel 1788
Family #21 Anna Margaretha Schmidt 1788
Family #130 Anna Margaretha Rau 1788 (different from below)
Family # 35 Anna Margaretha Rau 1789 (different from above)
Based on proximity, Anna Margaretha Schmidt lived the closest to the Kaltenbergers, #25, in 1798.
↑1834 Census of Grimm in the District of Saratov, Russia, dated 2 February 1835; Translated by Brent Mai, Concordia University, Portland, Oregon; Published by Dynasty Publishing, Beaverton, OR, USA; Published 2011; page 6, family #14.
↑1857 Census of Grimm in the District of Saratov, Russia, dated 5 November 1857; Translated by Brent Mai, Concordia University, Portland, Oregon; Published by Dynasty Publishing, Beaverton, OR, USA; Published 2005; page 7, family #15.
↑The 1775 and 1798 Census of the German Colony on the Volga, Lesnoy Karamysh, also known as Grimm; Published by the American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published date: 1995; see the family numbers above.