Hi Bruce
The North Dakota Department of Health includes the Public Death Index on their website.
A search for LINK, death for the decade of the 1950s, comes up blank for a Minnie or Wilhemina or any variation of those names. The only female death was a Carolina LINK, birth 07/01/1884, death 09/20/1958.
I do find the following:
LINK, WILHELMINE 08/15/1940 Burleigh FEMALE 58 Years 10/30/1881 North Dakota Mercer County
This fits for your grandmother except for the date of death.
You may find proof this is the correct woman and the location of her burial through a death certificate:
https://apps.nd.gov/doh/certificates/deathCertSearch.htmHave you contacted the Kronthal Cemetery where your grandfather is interred?
Do you know where the family resided in 1940? She may be buried in that location.
Beth
not related