I saw your posting and did a quick search in Ancestry, the only thing I could come up is an obit for another sister Jean, from 2004, that has Selah preceding her in death.
I didn't find anything in the Social Security index for Selah.
I found telephone listings:
Name: Selah Swanser
Address: 413 Broadway Ave
Zip Code: 59218
Phone Number: 406-787-5768
Residence Years: 1993 1994 1995
Here is the obit, you might be able to contact
a relative from the obit who might know how Selah died.
Evelyn Jean Louise Gilroy
Posted: Thursday, Oct 07, 2004
KALISPELL - Former Ronan resident Evelyn Jean Louise Gilroy, 86,
died Sept. 19, 2004, at Heritage Place in Kalispell.
She was born Sept. 6, 1918, in Lewistown, the daughter
of Wilbur and Dora (Lake) Ware. She received her early
education in the Spring Creek School at Brusett,
and her high school years at Miles City.
On March 31, 1937, she was united in marriage to
Bruce Gilroy at Oakwood, Ont., Canada. They were
married for 63 years.
The couple moved to Jordan in 1942 where they were
engaged in farming and ranching.
They also lived in Nebraska and Wyoming.
The family moved to the Ronan area in the 1960s
where they ranched and owned and operated the Mint Bar for over 20 years.
They moved to Kalispell in the early 1980s.
Her loves were her family, baking apple pies, the Montana
Fiddlers, dancing, playing cards and big game hunting
with her family.
She was preceded in death by her parents; her husband,
Bruce; a brother, Art Ware; a sister, Selah Swanser;
and a grandson, Dewey Holler.
She is survived by two sons, Art Gilroy and wife
Bonnie of Moccasin, and Dave Gilroy and friend Shirley of
Polson; two daughters, Bonnie Holler and husband Joe of
Chicago, and Trudy Eckley and husband, Cliff of Kalispell;
a sister, Alice Carpenter of Libby;19 grandchildren;
35 great-grandchildren, and several great-great-grandchildren.
Hope this helps,
I am not related