AUSTRALIA’s CONSTITUTION
http://bar.austlii.edu.au/au/legis/cth/consol_act/coaca430/
A Searchable copy of the Constitution is available here.
To understand the Constitution you need to understand that Her Mahesty or the queen appears forty times in it text.
The Coronation Oath on this site appluies to Her as She holds this office, and the Royal Prerogative post explains what Her name means in the Constitution.