Hi Deb, whatever info you learn from relatives you want to back up with documentation. We did not do that in our family and had a 30-year old mistake which didn't come to light until I tried to assemble documentation to join the Mayflower Society.
Anyway, I think her maiden name would be on her death cert but don't have any here to verify that. You could contact State of WA, Dept of Health.
However, it will be on her childrens' birth certs. Gertie, abt. 1892 and Carsie abt. 1890 were born probably born in
Douglas Co. and Fred born abt. 1904 in Douglas or Yakima Counties. The state didn't require birth certs until July, 1907 but I'd contact them first anyway. Center for Health Stats, Information 360-236-4300 or 360-236-4313.
If they don't have them, I'd Google
Douglas County County Auditor.
There are two rolls of microfilm of
Douglas County Birth Returns 1891-1907 at
Washington Archives,
www.cwu/edu/~archives/douglas.htm. I think you might need a volunteer to access them. To find a volunteer look at Random Acts of Genealogical
Kindness,
www.raogk.org. Be sure to tell them to look through both microfilms. Good
Luck