Maybe https://fi.wikipedia.org/wiki/Hatsina ? It's some 40 kms South-West off St. Petersburg. Some church books are available here https://spbarchives.ru/infres/-/archive/cgia/19/126?_archiveStorePo...гатчина but registration and small fee are required to access digitalized copies
I suppose that Anastasija Тюнина was born 1880, not 1980.
You can look there as well:
I can't talk much, I know the second great grandmother was a foundling. the second great grandfather was a Finn, but disappeared in the war (Finnish war or something). During World War II, the great grandmother was deported to Germany with her son and sister. From there they came to Estonia. The great grandmother was probably Orthodox and spoke Finnish and Russian.