OK.Hold on a while before ordering anything. Sorry for the convoluted journey tonight but I think we have found her.
Agnes L Hoppe: 1875-1951 buried in Greenwood Cemetery, Cathlumet, Wakiakum County, Washington.
Keep in mind that Agnes daughter Mary E married a Byron Farr and their daughter, Marie Anna married a George Centerbar whose parents owned a hotel in Cathlumet......
Think this is her, so the county might be Wakiakum.I found a volunteer there that does lookups in a book of listings of death records in that county.Sounds like there will not be any details but at least we will know if she died in that county instead of King county.