Will Camilla Be Queen When Prince Charles Becomes King?
When Prince Charles accedes to the throne as soon as practically possible following the death of Queen Elizabeth II, his wife Camilla, the Duchess of Cornwall, will have a new title: Queen Consort, with Queen Elizabeth II having expressed her 'sincere wish' that Camilla be crowned alongside the new King Charles when the time comes.
At the time of the Wales' marriage, Clarence House announced that Camilla would be styled as Princess Consort in the future when Charles become king. Seemingly it would be up to William as to whether he would bestow the title of Queen Mother on his stepmother Camilla. Otherwise, she would probably remain Princess Camilla. However it's unlikely that William would decline to give Camilla this title—after all, he was best man at her wedding to Charles in 2005.
You may be interested to know that Camilla, being married to the Prince of Wales, is the Princess of Wales, like Diana before her. Because Diana was so well-known by that title, Camilla has declined to use it.
Related: Before She Died in August 1997, These Were Princess Diana's Final Words
Meanwhile, the title Camilla does go by—Duchess of Cornwall—was one of the titles bestowed on Diana when she married Charles in 1981.
Next up, in The Crown, Prince Charles never stops seeing Camilla even before his marriage—is that true?