Head of the Household Martin Wittmann, age 63 in 1816, deceased 1831
Child #1 Johann Michael Wittmann, age 42 in 1816, deceased 1818
Wife of Child #1 Barbara Wittmann, age 54
Grandchild #1 Johannes Wittmann, age 31
Wife of Grandchild #1 Apollonia Wittmann, age 21
Great Grandchild #1 Christian Jakob Wittmann, age 1 year 9 months
Great Grandchild #2 Louisa Charlotta Wittmann, age 3 months
Grandchild #2 Konrad Wittmann, age 26
Wife of Grandchild #2 Anna Margaretha Wittmann, age 28
Great Grandchild #3 Wilhelm Wittmann, age 5
Great Grandchild #4 Johann Michael Wittmann, age 3
Great Grandchild #5 Johann Georg Wittmann, age 1
Grandchild #3 Johann Michael Wittmann, age 23
Grandchild #4 Johann Heinrich Wittmann, age 2 in 1816, deceased 1824
Child #2 Johann Georg Wittmann, age 19 in 1816, to household #239
She is not listed in the 1857 census with her birth family.
The most likely explanation is that she was married and living with her husband's family. When I find her in the 1857 census, I will add the appropriate details and sources here.
↑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 22-23, family #71, Martin Wittmann family.
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 30, family #75.