I wonder if you could check this voyage to see if it is her.
Departing Greenock 10th April 1925 for Saint John N.B.
Helen Robertson, 6 Davidsons Close, Cowdenbeath.
Country of intended residence USA.
If you know that the address she lived at in Cowdenbeath was the same as the above, then it's her.
...Although she went to St John N.B. her intended destination was USA.
Brian, Glasgow, Scotland
I will have a search for the other voyages but can't promise anything.