So? When she was in England she could have claimed it if she wished. As far as the United States was concerned, She was an American Citizen, and so her son was therefore a "Natural Born Citizen."
Hence the children would have dual citizenship. With regard to their mothers' British (or Canadian) subjecthood, they would have been born with a (theoretical) dual loyalty or allegiance. Hence, by some of the natural born citizen theories, Wilson (and Hoover) would have been ineligible for the presidency.
You must have missed the part where I mentioned that Until 1934, wives were automatically naturalized upon marriage. Your point is moot.
Why do you not know that that is completely relevant?
Because it is at odds with the facts, as are most of the arguments to which I find myself responding.
Wilson would presumably have been eligible for dual citizenship in the eyes of the British government. Was he then a natural born citizen, even though his mother may have been recognized by the British government as a British subject all along?
It's amazing how you think this is all so simple and settled. If it's simple and settled -- a no-brainer -- then you lose because the consensus has already been established and it goes against your view. Only if there's some ambiguity and difficulty and uncertainty does your view have a ghost of a chance.