Her calculated birth year, based on the age given in the 1834 census, is 1791. There were no Anna Margaretha's born in 1791 listed in the 1798 census. There were, however, two born in 1790 and one in 1791:
Family #141 Anna Margaretha Turin 1792
Family #118 Anna Margaretha Erdman 1790
Family #A6 Anna Margaretha Schwagerus 1790
Since her future husband didn't live in 1798 at the time, there is no family number with which to compare it. Studying the maternal haplogroup of anna Margaretha's female descendants could help narrow down her maternal ancestry.
Sources
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 55, family #184, line 2136, Anna Margaretha Joze, age 43.
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. Use to view possible last name at birth families only.
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