The website that youre citing is a British site for the British monarchy  It is a government site maintained by the British monarchy  The website for the Canadian monarchy is run by the Canadian government and names Elizabeth II as the Queen of Canada as does the website for the Canadian Governor General the Queens representative in Canada  The website for the Governor General of New Zealand refers to her as the Queen of New Zealand  This site is run by the government of New Zealand on behalf of the Queens representative in New Zealand  And so on  Saying that because the official website for the British monarchy refers to the Queen as the Queen of the UK and the other Commonwealth Realms its appropriate for Wikipedia to do so is displaying a bias towards the British monarchy over the other  realms that also have the Queen as the head of state  Furthermore on the website for the British monarchy the Queen is referred to as Queen of X when you go into the individual pages for her realms where X is that realm not the UK and whatever realms page were on  In fact in all of the pages it says some variation of The Queens relationship to St Vincent and the Grenadines is unique In all her duties she speaks and acts as Queen of St Vincent and the Grenadines and not as Queen of the United Kingdom