Although it was possibly less common by 1915, genealogical research by my favorite "her" (mostly in Ellis Island records) has found that booking ship passage under assumed names was quite common, especially for females travelling alone. Our findings of "confirmed" disguises suggest that, although instances of the practice were known at those earlier times, the practice quite probably was even more common than what was then suspected. (Or that "her" ancestral family included a lot of "liars" (?))

A fairly common ex post facto explanation was that a female wanted to accompany "her male friend" but for some reason the couple was unable (even discreetely?) to be married before "getting out of town." She might use a name-disguise to reduce the odds of being caught and detained by "family" or others. Her male friend likely would not need to disguise who he was (perhapsbecause those who might object might be happy to see him gone?). In a few cases, a married couple who had not declared their marriage might need to continue the concealment in the old land, with the expectation of announcing it at sea or after debarking.

This is not to suggest the likelihood that "Maggie" might have been someone else prior to boarding; but it is something to be considered as "at least possible." By looking beyond the ship manifests at evidences of persons indentifiable in census records, church accounts, newspaper reports, and wills and deeds occasionally one can find some who "disappeard to unknown places," and who may be "connected" to a person otherwise known to have been on the ship. This is an extremely difficult kind of research to actually do, with any real likelihood of success; but even a few clues can at least eliminate one guess so you can guess again.

It's a lot easier to confirm such connections with some knowledge of at least one of the persons involved, which doesn't appear to be the case for Maggie.

For a successful voyage, there is often a marriage shortly after arrival that "proves the case," once bits and pieces from other evidences are filled in. The Titanic changed lots of people's plans, so that sort of evidence is probably unlikely in Maggie's case.

John