Camilla will be protected. Charles will have already seen to that. The former Queen Mother was the former Queen. She was used to a high level of public appearances and interactions. Camilla is mother and grandmother of a close family. Her focus is Charles, outside of her descendants, and it’s unlikely she would have any interest in being prominent if it wasn’t to support him. All the recent gossip has been about Elizabeth’s support for Camilla to marry Charles.
Charles should have been allowed to marry Camilla in the first place back in the 70s.
So will Camilla be, if she is widowed. Neither she nor the former Queen Mother were hereditary queens; but they each were given the title because they were married to a hereditary sovereign King.
The difference is that Elizabeth Bowes-Lyon was the biological mother of the sovereign Queen Elizabeth II.
Camilla, no biological nor adoptive relation to William and not married to his father during his childhood, would not be entitled to use the style "Queen Mother." Rather she would be "Camilla, Queen Dowager" or "the Dowager Queen."