what is the differnet. Why was she never officially given the title Queen?

If you are talking about "Anne of Great Britain" (6 February 1665 – 1 August 1714) then she was
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# 8 March 1702 – 1 May 1707:
Her Majesty The Queen [of England, Scotland and Ireland]
# 1 May 1707 – 1 August 1714:
Her Majesty The Queen [of Great Britain and Ireland]
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Anne Boleyn was considered a queen of England, not of Great Britain. It is just that history remembers her by her full name. When she reigned she was called queen.