OK--very good work. I guess we ignore the possibility that Texas exercises the option. We further assume as I think I have heard elsewhere that there are no other gaps in her record. If you assume Canada in 60, that still leaves her 4 years in the US after college and I believe she had a significant job record that supported that conclusion.
I wonder if you are working with the correct statute? There was a 1970's effective date amendment that changes the periods. I have been less worried about that for the reason that as I recall, the periods are more favorable for our position that the five years after 14 statute.
That still leaves you with a Con Law problem--invalidity of the Mother Citizen Child statute because the son of a father under those circumstances would not pass--that is subject to repair. You retroactively provide that a child of a father citizen who can prove descent (DNA evidence or other acceptable standard) gets citizenship on the same basis as the child of a mother citizen.
That still leaves you with the existing Con Law view of Article II Sec. 1 which is that it means within the geographical territory of the US.
You put the fix on that with an amendment that defines Natural Born Citizen to include someone who is a citizen at birth--maybe you add some other requirements like two of four grandparents and five of eight great grandparents.
If I were really the lawyer doing this, I would look for a way to get the current guy out of the definition because I still think there is hope that we can undo many of his acts which required a "president" to effectuate.
I think the simplest is: American, born, bred and raised.
That is:
Born on US soil.
Born of two citizen parents.
Raised in America.
The founding fathers wanted that one office to only be held by someone with no hint of divided loyalties.