Hi Dan, an Ella M. Osborn b. 13 Feb 1878 died 15 April 1966, Ontario, Malheur Co. Source: Social Security Death Index.
An Ella M. Osborn, spouse-Milton, died Baker Co 7 April 1966 per death cert #5035. Source: OR Death Index. It is not totally unusual for these two data base to not be in sync.
There is a Random Acts of Genealogical Kindness volunteer, www.rogk.org, choose Oregon, choose Malheur who does public record lookups and copying. I'd contact her first and see if she can find Ella's obit.
However, it might be in Baker County.
You can also use the University of Oregon obit service by sending an EMAIL to Jenni Lee:firstname.lastname@example.org. They charge $30/hr research with a $7.50 minimum which is what I was charge for the last obit I requested.
There is also the Oregon Library System, http://www.oregonlibraries.net/http://www.oregonlibraries.net/choose Malheau County. OLS seems to charge from $5 to $15/obit. Successful Hunting!