You are welcome
It's all a bit off topic as this is the
thread of their current events, plus: I'm not a real expert for
these questions
but I'm quite sure that it does not have
anything to do with Caroline's past nor her experiences with the
Catholic church. I think it's because of Alexandra's position.
There was the so called "Act of Settlement" at the beginning of
the 18th century, the Parliament of England controlled the line
of succession with that and still does. The law says that Catholics
can't become kings or queens. As a result of his marriage with
Caroline as a Catholic, Ernst August is excluded from the line of
succession, Alexandra is not, as she was baptized as a Protestant.