And for those wondering why the Queen calls herself "King" it was common in old cultures when a woman became the one in charge to adopt the title of "King" since in some languages the word King isn't gendered or the word for the leader spouse was literally just "consort" on something similar.
"Queen" literally means "King's wife" (or widow) from Middle English's
quene, but it also means "female sovereign, woman ruling in her own right, female ruler of a state"; it is ultimately derived from the Old Saxon
quan, meaning "wife", with the latter meaning deriving from Old English
cwen (itself also derived from Old Saxon's
quan); beyond that we hit the PIE root *Gwen-. In no language is Queen NOT gendered; however, "King" is itself not gendered, which is why female rulers historically could and would call themselves kings, like the Polish King Jadwiga; the problem was getting to the position and being accepted by the peers of the kingdom, as was an issue for her sister, King Mary of Hungary and Croatia, as they preferred her cousin, Charles III of Naples, to her, and her husband Sigismund to her, as well, especially after she abdicated the throne for Charles but then he was murdered at the behest of her mother, paving the way for Sigismund to press his claim as legitimate heir (her father had named him as such in actuality) and become King of Hungary and Croatia, on top of his already formidible power as the Margrave of Brandenburg, which eventually led to him becoming the Holy Roman Emperor.