because she will not be queen-not be an anybody-when King Charles dies
Well, assuming Camilla outlives Charles, she will still be Queen Camilla, or the Dowager Queen, I would imagine. She will definitely still be ‘somebody’.
Queen Alexandra, Queen Mary and Queen Elizabeth were still all called that when they were widowed.
The latter probably assumed the title of Queen Mother to distinguish from her daughter, also Elizabeth. As she was only 51 when her husband died, the ‘dowager Queen’ title would have sounded rather ageing.