1901 census for 138 St James Road, Glasgow has a family group consisting of:
Alexander Howie born Scotland
wife Joan Howie born England
daughters Mary, Janet, Catherine and Alison all born Glasgow
son John W born Glasgow
so this fits with the family of the Catherine Howie/John Burnett marriage and names/address mentioned in travel records.
How certain are you that the 24/12/1869 death of a Catherine Burnett in Montreal, is the Catherine O'Neill of the 1891 Antrim birth?
Did you note that by coincidence or otherwise, in the same cemetery is a Catherine Victoria Burnett died 1987 - the same names as the child born to Catherine Howie/John Burnett, possibly also Catherine Howie's full name, so depending on age, perhaps the latter?
HOWIE
CATHERINE VICTO
F
1894 644/6 862 St Rollox