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She was called the Queen Mother (or 'Queen Mum') because she was the mother of the queen.
H.M Queen Elizabeth The Queen Mother, (Elizabeth Bowes-Lyon) was the mother of H.M Queen Elizabeth II.
Mother is to daughter as queen is to princess because the queen is the mother of the princess.
The Queen Mother was Queen Elizabeth II's mother.
if you mean queen elizabeth, the queen mother of england, she was crowned queen consort in 1937