That's accurate -- but not entirely descriptive, which is why I chose to call her his widow . The original meaning of "widow" is a woman who lost her husband and has not re-married.
Priscilla did marry and divorce a second time (briefly) several years after his death but she has always kept the Presley name and done what a widow normally does: she's a Presley, helps manage his estate and business interests and is always part of stories about him.
Yes, Elvis and Priscilla divorced but the main problem in their marriage was he said he could no longer have sexual desire for a mother (especially the mother of his child) so they divorced but remained very close, spoke of reconciling in the future. In the film, they talk about being remarried when he's 50 (though he never got to be 50). They walked holding hands from the divorce court and he sang her "I will always love you." He had many lovers but only one wife.
I could actually make the case that Ann-Margret was his "soul mate," and great love but Priscilla was clearly his bride/queen and yes, I'd call her his widow because she carries on his estate and memory the way a widow would. I remember her well from her years as an actress on "Dallas" and several films but she public persona over time has had far more to do with Elvis than with her own career. It's a fascinating life story to study. Thanks for reading and commenting!