This conundrum has beset several of my family's researchers (including the Canadians) for many years and I would love to be able to finally lay Minnie to rest.  
Minnie was born around 1884 in Ireland to John White Forsythe and Isabella (Boyd) Forsythe her birth cannot be traced possibly due to the fact that the name Minnie may not be her birth name!  

  However she was always known as Minnie.
She appears with her family on the census for 1901 in Carrickfergus.  
1901 Census of Ireland
4 West Street - Carrickfergus - Co Antrim
Forsythe   John   47   M   Head   Congreg   Antrim   Draper      R&W   M
Forsythe   Isabella   46   F   Wife   Congreg   Antrim   -      R&W   M
Forsythe   Agnes   22   F   Dau   Congreg   Antrim   -      R&W   S   
Forsythe   Minnie   17   F   Dau   Congreg   Antrim   Dressmaker     R&W    S
Forsythe   Isabella   14   F   Dau   Congreg   Antrim   Drapers Assistant   R&W    S
Forsythe   Edith May  3   F   Dau   Congreg   Antrim   -      Cant read    S
The family emigrated to Prince Albert, Saskatchewan, Canada
Ship:  IONIAN
Departure Port and Date:  Liverpool, England - 1903-06-04  Londonderry, Ireland - 1903-06-05
Port and Date of Arrival:  Montreal, Que. - 1903-06-13
List Number: 27
Reference:  RG 76
Microfilm:  T-481
The family consisting of John (48) and Isabella (47), Edith May (4) Minnie (19) and young Isabella (16) embarked Londonderry 5 June 1903 arriving in Montreal 13 June 1903.  Page 17 of the passenger manifest lists the family near the bottom of the page.  William travelled earlier.
Minnie appears on the 1906 Census of Saskatchewan
sub district 34
entry 190
Forsythe Wm   Head   M   Single   26   Ireland   1903
Forsythe Minnie   Sister   F   Single   23   Ireland   1903
Forsythe Isabella   Sister   F   Single   21   Ireland   1903
At that time her parents and younger sibling Edith had returned to Ireland.  There is a possibility that Isabella jnr and Minnie came back to the UK at some point after 1906 returning to Vancouver with their parents in 1907.  However Minnie is missing from the census of 1911.
1911 Census of Canada
British Columbia - Vancouver City - District 12 - Page 48
No 2631 
Forsythe John              M     Head     M     Mar     1854  Painter
Forsythe Beatrice (sic) Isabella    F    Wife    M    Mar    1855    
Forsythe Wm.            M    Son    S    May    1880 Salmoner???
Forsythe Isabella            F    Daughter    S    May    1888 Stenographer
Forsythe Edith            F    Daughter    S    May    1897 
Family history has it that Minnie married in Alberta and died in childbirth soon after, but of her marriage and subsequent death no trace has ever been found.
Can you help??