Don't know if you found the information you were looking for on your grandmother, and this may or may not be her. These births are from the Calif. Births and perhaps Laura is your Mother?And Vernon a Brother?
the only florence Bertha to come up on the Calf. Death with the maiden name of Johnson.Birthdate is close to what you had. DUDLEYFLORENCEBERTHA01/09/1914TALBOTJOHNSONFMINNESOTAALAMEDA(01)03/13/1980550-16-877366 yrs