Hi Joyce, Almost all of the Douglas County Cemeteries are listed at usgwtombstones.org/oregon/douglas.htm .If you scroll down to about the middle of the page, there are two volunteers who will investigate which cemetery your Minnie is buried in.
There are three in or near Canyonville: Canyonville Cemetery Pioneer Cemetery, Canyonville Wm D. Bradley Cemetery, Canyonville
If all of this doesn't work out, you might need to order her obituary or death certificate. Sometimes the cemetery is named in those documents. Successful Searching!