Henrietta Maria, Charles I's queen consort, was a famously strident Roman Catholic. She outraged her husband's subjects by praying publicly under the gallows at Tyburn, where many Roman Catholics had been killed for their faith, and, in private, attempted to convert her Calvinist nephew, Prince Rupert.
Her husband, Charles I was beheaded in 1649 at the close of the English Civil War, and Henrietta Maria survived him by over twenty years. Charles I was still a Protestant at the time of his execution. Is there any evidence as to what the queen dowager thought - or might have thought - regarding his eternal fate? Did Henrietta Maria herself, or her courtiers (based on what Henrietta Maria had told them), leave any writings which elaborated on what Henrietta Maria thought had happened to Charles in afterlife? Did she believe he was in heaven or in hell?
If she did not mention this or if this mention has not survived to our time, a general answer with respect to what being out of communion for Catholics of the mid-17th century meant is also suitable.
What spurred me to ask the question was reading about Henrietta Maria, and then recalling an article I had read a while ago about the many mixed marriages—Catholic and Protestant—in Europe during the Thirty Years War. Henrietta Maria and Charles I are the most famous example of such a marriage that I can think of, and seemed like an interesting test case of what such spouses might have thought about each other.
Note: Current edits have incorporated suggestions and clarifications from the comments.