WHEN THE QUEEN OF AUSTRALIA WAS CREATED - IT WAS NOT 1973.

There was a meeting of Prime Ministers of the Empire in London in December 1952. 
This meeting is now known as the Commonwealth Heads of Government Meeting aka C.H.O.G.M.
At this meeting, it was decided that each Commonwealth would be granted permission to designate the style and title of their monarch.
It was also decided @ this meeting that Elizabeth would be next in line to the throne.
In 1953, England passed the Royal Style Act that statutorily gave the aforementioned permissions. This Act was the first proclamation of Elizabeth. 
READ THE UNITED KINGDOM ROYAL TITLES ACT 1953 HERE

Most, if not all Commonwealth nations followed suit with the Menzies liberal government passing it in Australia, later that year. 
READ THE AUSTRALIAN ROYAL STYLE AND TITLES ACT HERE

The office of the Queen of England, Australia and her other realms was included in Australian statutes for the first time. 

The 1973 Royal Style and Titles Act amended the 1953 Act removing the United Kingdom from the title "Elizabeth the Second, by the Grace of God of the United Kingdom, Australia and her other Realms and Territories Queen. Head of the Commonwealth, Defender of the Faith". 
You can read some background material gained by a friend of mine by 
CLICKING HERE

OR HERE