In this census, the significant age difference between the two youngest children may indicate that Anna Margaretha was Johann Jakob Saltzmann's second wife.
Family # 427
Head of the Household Johann Jakob Saltzmann age 45
Wife Anna Margaretha Saltzmann, age 44
Child #1 Heinrich Saltzmann, age 22
Wife of Child #1 Eva Katharina Saltzmann, age 19
Grandchild #1 Elisabeth Saltzmann, age 4 months
Child #2 Johann Jakob Saltzmann, age 18, lives in Zolotoye, Saratov
Child #3 Karl Saltzmann, age 3
↑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 61, family #163, Johann Peter Saltzmann family.
↑1897 Grimm (Lesnoi Karamysh), Russia Census List, Translated by Richard Rye, Compiled and edited by John Groh, Contributor Henry Schmick; American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published 2017; page 207, family #427, Johann Jakob Saltzmann family.