Call Diana what you will, she was a virgin with more British royal blood than his and he managed both to use her and destroy her long term.
If this is true about the Queen she has suddenly come back to her senses which have most usually been upright throughout her life.
She was part of refusing the American Wallis Simpson admission to Britain, why would she welcome this one unless it's because she's a Brit from a long line of family females who likewise "served" their Kings.
She would not likely have been on the throne but for the American--but then, Chuck has a lot in common with his flaky Uncle the former King.
And Di destroyed herself,whilst attempting to destroy the monarchy...like the spoiled brat she was.