Ontario Archives are in Toronto. They won't do lookups.
Births are released to 1913; marriages to 1929 and deaths to 1939.
You can get her death from Ontario Vital Stats in Thunder Bay. Ask for the long version. They used to cost about $22. Google for the address.
I don't know about Nfld records as they didn't join Canada until 1949 so their records are either in Nfld or England.
Again, Google for a Nfld genealogy site. There are lots of researchers, some for free.