Hi, Have you searched Border Crossing Records for Mary BOYD and family
Where have you searched for a Record of Death for Mary BOYD nee GIBSON
Have you contacted Govt. Vital Statistics Registry offices - asked for a search?
Internet / Ancestry - does not have everything - it is an ongoing process - depending on access to information - and persons submitting info etc - also time.
Have you searched Canada Census - 1901 - USA Census 1900.
What were the names of the Children - did all go to Michigan?
Perhaps researching the children - will lead you to information about Mary