This look like your Harriet ~ went back using Roberts ??
California, Death Index, 1940-1997 Name: Harriett Jane Roberts [Harriett Jane Ferguson] Gender: Female Birth Date: 25 Feb 1867 Birth Place: Missouri Death Date: 10 Jun 1956 Death Place: Los Angeles Mother's Maiden Name: Callaway Father's Surname: Ferguson
Source Citation: Place: Los Angeles; Date: 10 Jun 1956.
Source Information: Ancestry.com. California, Death Index, 1940-1997 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2000. Original data: State of California. California Death Index, 1940-1997. Sacramento, CA, USA: State of California Department of Health Services, Center for Health Statistics.