A monarch, male or female, ie. including of course a Queen regnant, is monarch from the moment the previous one dies (the King is dead, long live the King).
So he/she has a 'right' to wear a crown immediately.
Now a coronation is all about being crowned. So before the coronation the 'Queen' (if not regnant) is only a Queen by dint of her marriage (not birth) and has not yet been crowned. Once she is crowned, after her husband, at the coronation, then she has the 'right' to wear a crown.
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