Been looking for a 'Royal' Elizabeth story I've read before!

Hello! Can anyone point me to the right direction? I've been searching for this one story where Mr. Bennet had a relationship with a visiting Spanish Princess (if I'm not mistaken). I think he was already unhappily married to Mrs. Bennet at that time and Elizabeth was the result. Elizabeth's royal mother went on to marry another and entrusted Mr. Bennet with Elizabeth. After that, they lost contact.
This story has been bugging me for awhile now lol

Any other stories where Elizabeth is royalty are welcome too. Thanks!