Family #126 in the 1798 Grimm census.
Family #253 in the 1834 Grimm census.
Anna Margaretha Mauer was from Rothammel, a Catholic village on the east side of the Volga, while Grimm is a Reformed colony on the west side of the river.
Also known as Pamyatnaya, the colony was founded on August 21, 1767 and named after its first mayor.
Typically there was little intermarriage between Catholics and Lutheran & Reformed settlers, but somehow, perhaps in Saratov or another larger city, Jakob Reizenstein met Anna Margaretha Mauer and married, choosing to settle in Grimm rather than Rothammel.
Anna Margaretha is not mentioned in the 1834 census, when she would have been only 64. All of her children were adults by 1828. It's possible she outlived her husband Jakob and remarried, living with another family. More than likely, however, she probably passed away prior to 1834. By that time, the four younger sons moved to a different household, #288, and only eldest son Michael remained in his father's house with his wife and six children.
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; family #126 in the 1798 census, Anna Margareta Mauer from Pamyatnaya [Rothammel], age 28.
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; page75, family #253.
Beratz, Gottieb. The German colonies on the Lower Volga, their origin and early development: a memorial for the 150th anniversary of the arrival of the first German settlers on the Volga, 29 June 1764. Translated by Adam Giesinger (Lincoln, NE: American Historical Society of Germans from Russia, 1991) : 352.
Klaus, A.A. Our Colonies. Saint Petersburg, Russia, 1869.
Mink, A.N. Historical and Geographical Dictionary of the Saratov Province [in Russian] (Saratov, Russia, 1898): 736-739. (Online)
Orlov, Gregorii. Report of Conditions of Settlements on the Volga to Catherine II, 14 February 1769.
Pallas, P.S. Reise durch verschiedene Provinzen des Russischen Reichs. Theil 3,2, Reise aus Sibirien zurueck an die Wolga im 1773sten Jahr (St. Petersburg: Kaiserl. Academie der Wissenschaften, 1776): 622.
Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 11, 81-87.
Preliminary Results of the Soviet Census of 1926 on the Volga German Autonomous Soviet Socialist Republic (Pokrovsk, 1927): 28-83.
Schnurr, Joseph, Die Kirchen und das Religiöse Leben der Russlanddeutschen - Katholischer Teil (Stuttgart: Selbstverlag Joseph Schnurr, 1980): 253.
"Settlements in the 1897 Census." Journal of the American Historical Society of Germans from Russia (Winter, 1990): 18.