I do believe she had to change the religion to legally marry into his religion, not her choice at all,
but a rule.
correct me if i'm mistaken
my ex sister in law had to become a catholic to marry my brother in law, so they
could marry in the church, its a simple thing to do, a formality to make things
legal.
there was studying involved, some questions and answers before she was accepted,
not difficult.
Sounds right as I know the English monarch is the head of the Anglican Church.