Have you tried to find her brothers/sisters on immigration lists? I see that she was living in Township 1, District 6, Placer County in 1930. In Township 1, District 5, Placer County in 1930 was a man named Chinonosuke(?) Mayeda, age 61 and it looks like he immigrated in 1899.
Sailing on the Coptic, port of arrival was San Francisco, 17 April 1899, was a Chonosuke(?) Mayeda, age 29 and 1 month, Merchant. His last residence was Wakayama. Above his name is Hiroshi Mayeda, age 35 and 2 months, Farmer.