I followed the Thomas Alexander Fraser with wife Catherine (nee Kennedy and both were from Argyll). They are still in Nova Scotia in the 1881 census, along with son John A and other kids.
Thomas died in Brandon, Manitoba in 1885, then the rest of the family moved across Canada and down to Washington state as we followed previously.
https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=84601856&ref=acomI really can't see how this fits with your family.
From Scotlandspeople, I took a look at the marriage of Angus Fraser and Catherine McPhee (Daviot and Dunlichity, Inverness). His parents were John Fraser and Marjory Rose, both deceased, and Catherine's parents were John McPhee and Janet Cummings, which matches with the parents named on Catherine Upper's death registration. The witnesses to the marriage were John Smith and James Fraser. It's really looking like this is your Catherine to me.
Do you have the birth reg. for your GG grandmother to know her parents names?
Angus didn't necessarily die in 1871. The CGI reference is to page 351 of the 1871 Lovell's Directory. If you look at that, you will see the entry for Fraser, Catherine (widow Angus). The CGI is just
noting that in 1871, there was a deceased Angus in Goderich. At Ancestry, go to Lovell's Canadian Dominion Directory, 1871, page 351 (image 188/999) to see what I mean.