Here is a possible match in the 1957 Spokane City Directory, which would help pinpoint her year of death:

604 North Central Apartments
1 Vacant
2 Austin Grace Mrs A FA 5-0008
3 Wilson Sybil Mrs A FA 8-2056
4 Kottre Mary Mrs A FA 8-6675
5 Garcia Max A FA 8-1423
6 Spangler Ronald L
7 Vacant
8 Rios Eddie R A FA 8-131*
605 Mlkoskl Martin C ©
608 Hoag Lora V Mrs A FA 8-4614