That's an interesting point about Orczy's title. I googled and found this:
Quote:
1. George V took the view that the use in this country of foreign titles of nobility should in due course be discontinued and, in 1932, he revoked the Royal Warrants listed in the fourth column of the attached Annex which had allowed the use of the foreign dignitaries and titles set out in the second and third columns of the Annex. The current holder, his son and grandson where named could continue to use the title for his own lifetime.
2. Apart from these exceptions official recognition is not given to the use of foreign titles by British citizens and care should be taken not to address any British citizen (whether by naturalisation or otherwise) by such a title.
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So presumably, at the time she was writing at least her earlier books, it was okay to use her foreign title.