Hi
I found a Form 30A for Mary Louise Milburn travelling from London to St. John, NB in July 1923 aboard the Montcalm.
Mary is 36, accompanied by husband William Milburn. Mary states she has never been in Canada before and intends to reside permanently in Canada. They are destined for Brandon, Manitoba.
Mary's nearest relative in the UK is her mother, Mrs. Katherine Lee, #1 Rosemary Lane, Whitehaven.
On the ship's manifest, it shows Mary is a housewife and William is an engineer.
On his Form 30A, William states he is 40, his intended occupation is Railway employee, his birthplace was Whitehaven, Cumberland, his citizenship is Canadian. He has lived in Canada before at 327 18th or 8th St., Brandon, MB. Previous port of entry was Quebec on 10-8-1920 (I think...year is smudged); departed Canada from St. John, NB, Dec 12, 1922; reason...holiday after married. His nearest relative is his brother, John R. Milburn, in Brandon, MB.
This looks like it could just be your Mary!!
Susan