By the way, to trace your family history in Russia, I would HIGHLY recommend finding someone who can translate a short and polite genealogical query into Russian, and then posting it on the forum at http://www.vgd.ru/
From what I understand, genealogy in Russia is difficult if you do not live there and do not speak the language. Almost all sources are in the Russian State Archives and must be paid for; due to the turmoil of the 20th century, many places were bombed off the map and many millions died during the Revolution, Civil War, both World Wars, and Stalinist purges. However, we can hope that some helpful Russian person on VGD's forum might be able to help you.
On VGD, click on ФОРУМ and then "Поиск предков, родичей и/или однофамильцев" (Search for ancestors) then select "Г" (Russian letter G) then "Га - Ге" and then post your query about your Getsch ancestors. If you know ANYTHING such as Russian spelling of surnames, patronymics, dates, locations, etc., include it in your message so the forum users can help you.
How did your grandmother even get to the US in the 1930s, that was in the Stalinist period and emigration was all but impossible at that time.