In the British monarchy, there are four types of Queen title: - Queen Regnant, who reigns herself - Queen Consort, who is married to a reigning king - Queen Dowager, a widow carried the Queen Consort title while her husband was alive - Queen Mother, the mother of the reigning king which is a type of Queen Dowager but higher ranking.
Supplementary material for Twilight Princess has confirmed that Zant's invasion came just before Princess Zelda was going to be properly crowned.
Zelda notes that it seems to be unusually attached to her, and Impa thinks it sees itself as her knight.