I had posted a lookup request to the IN-CENSUS-LOOKUP mailing list for Nellie LAMBERTSON, widow of Samuel, hoping to find her in 1930. In the 1920 census, she was living in the 6th ward of Indianapolis, working as a seamstress. Nellie's birthplace was listed as Massachusetts.
I received a reply from a researcher stating no one with the surname LAMBERTSON was listed in the 1930 index of Indianapolis.
Either Nellie was deceased by then, or she was not living in Marion Co., IN.