Hi Paul, You know that Naoimi SHEARMAN b.1886 England - arrived Canada 1912 - Crossed into 1917. returned to England 1920 -dcd age 95 1981.

Was there an Obituary published ? It may mention Dora and other family members - and their location.
Deaths of Parents or other family members - that may mention location of Dora.

Passenger List: did it mention destination other than Canada or USA - did it mention a contact person? location.

Border Crossing Canada to USA
should show - residence at the time ?? - destination ?
Name of Contact in the USA?

Have you posted to the Message Board for Ontario ?
Ontario boards are very active - very well known. read - may be much more helpful

Have you searched 1920 USA Census ? 1930 USA Census
Perhaps Dora remained in USA - not married at the time ?
Cheers, Stella