I believe this death record to be her. I think the middle initial "H" stands for her maiden Howie and the POB matches. All the censuses where taken before May making it seem like she was born in 1901, instead of 1900.
*California Death Index
Name Gertrude H Smith
Event Type Death
Event Date 19 Nov 1968
Event Place Los Angeles, California, United States
Birth Date 19 May 1900
If you look at her marriage return to Ray Coen in October 1922, she states she turned 22 at her last birthday, which indicates she was born in 1900. If you look closely under her age of "twenty-two" in smaller print is the date " May 19".
I assume this to be her actual month and day of birth, which also matches what was on the CA death record for her DOB.http://www.digitalarchives.wa.gov/DigitalObject/View/CA82D37...