Just to update the request, the information I needed on Hattie (BAILEY) CAMPBELL has been found. The family moved back to Kansas, Nemaha County, a few years after they had gone to the State of Washington. Hattie died in Kansas and is buried in the Ontario Cemetery in Nemaha County. The following cemetery information is listed online at USGenWeb, in the Tombstone Project:
BLOCK 33 OBIT SENECA 5/4/1899 WETMORE 4/28/1899 NAME CAMPBELL Hattie M BAILEY BORN 12 MAY 1865 DIED 23 APR 1899 MARRIED 23 FEB 1883 SPOUSE Henry G CAMPBELL
Obituary from the Nemaha County Spectator, Wetmore, KS, Friday April 28, 1899, p. 1: "Ontario. DEATH OF MRS. CAMPBELL......"