No she wasn't, because of Salic Law the moment she became Queen the British link to Hanover ended. Her Uncle Ernest Augustus, the Duke of Cumberland acceded to the Hanoverian throne when his elder brother King William IV died on 20 June 1837. Becoming Hanover's first resident ruler since King George I.
Karen, I think José was referring to the fact that Victoria was the last British monarch of the House of Hanover, not that she was the actual ruler of the kingdom of Hanover which, as you correctly point out, passed to her uncle, the Duke of Cumberland.
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