Local Histories, con't
Of course, I found her name through a diligent search and discovered that her last name was Wenzig and her first name wasn't even "Grace". It was "Gertrude". Anyway, the Wenzig family disappeared from the census in New York. I found them in Brooklyn in 1900 but did not find them in 1910
Where did they go? I wondered. I did a google search and finally found them in Arkansas. I did this by locating a county history. Try local histories if you can.