Sonia sent me by email an original document with the following text. May be posted elsewhere - this is a looong thread. The document shows that the Margaret May Thompson in San Francisco (living with her sister Wilhelmina, who is married to Carl B. Johnson) has the exact same birth day/month/year as "our" Maggie May Thompson in Australia. Also shows that she formally changed her name from Maggie to Margaret in her US registration.
Great work Sonia!
Margaret May Thompson 1954 18th Avenue, San Francisco, California Born January 3, 1890 Date certificate issued: August 18 1952 U.S. District Court at San Francisco NAME CHANGED: from Maggie May Thompson Alien Registration No. 3 482 767