Helen won a Best Oscar for her portrayal of an older Elizabeth in the 2006 movie "The Queen", but has insisted she would turn down any offer from "The Crown"'s producers.
"Not me!" she tells Britain's Daily Mail newspaper of who should be cast as an older Elizabeth. "Claire absolutely nailed it; and I know that Olivia will do the same. I'm an actress, and there are other roles."
Helen says she felt audiences "loved" the Queen herself rather than her performance, and believes there's something special about royalty.
"If the Queen walked through that door right now, we would all immediately look at her and do whatever we do to make her the Queen," she adds. "We do that."
The 74-year-old is playing another royal, Russia's Catherine the Great in a new miniseries, but says she now fancies a change from playing blue blooded characters, adding: "Working class women from now on!"