Interesting idea for a timeline, if you could butterfly her birth to the USA somehow....
I once did a list of alternate presidents that involved a bunch of foreign-born leaders in the U.S. titled "A Nation of Immigrants". Josef Stalin (D-NY) was deposed after four years by a GOP ticket with "Dolf Hitler (R-OH)" as the Vice Presidential nominee. Churchill and the internationalists, however, wrested the nomination from that wing in 1940. Other notables were Eamon DeValera (D-MA), Brezhnev (D-PA), Kissinger (R-NY), and Brzezinski. Thatcher was Reagan's VP and served in HW's term. Dubya was elected after the Blair era in 2004 with Putin (R-AK) as his VP.