Did you find Sarah/Sara in the 1930 census?
.....Neighbors may provide search contact clues
.....Possible variations in name spellings

What about in later City or Telephone directories?
.....It is likely she is listed

Have you contacted local genealogy societies?
.....Often groups will have extracted such records.

Where was her church membership?
..... You may need to set a database and a systematic plan to contact each
beginning with those closest to her last know residence.

Who handled burial arrangements?
..... It might help to compile a database of all and set up a plan to contact each

What cemeteries might she be buried?
..... Is there a listing of providers of such services