1920 census in Oakland, Alameda, California states she is widowed and immigrated in 1897! however, the children are the same, and her age roughly the same...
Ruby Murch Head F 40 New Zealand
Francis G Murch Son M 8 California
Carl M Murch Son M 6 Missouri
Hazel Boarder F 16 California
Birthplace New Zealand
Immigration Year 1897
Father's Birthplace Ireland
Mother's Birthplace England
New Zealand Birth Index, ref # 1879/17516
Ancestry.com. New Zealand, Marriage Index, 1840-1934 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. [Murch]
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MP14-V9K : accessed 9 April 2017), George F Murch, Brooklyn Ward 31, Kings, New York, United States; citing enumeration district (ED) ED 1030, sheet 16A, family 356, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 984; FHL microfilm 1,374,997.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH39-986 : accessed 9 April 2017), Ruby Murch, Oakland, Alameda, California, United States; citing ED 28, sheet 6B, line 64, family 150, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 87; FHL microfilm 1,820,087.
California State Archives (Marriages): Ancestry.com. California, Marriage Records from Select Counties, 1850-1941 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014. [Kemmler]