If you saw my earlier post, ignore it...I hadn't seen your latest posts...she could have been legitimized but not been named heir to the throne...that has been done in the past, and her character...it doesn't work with someone younger. And you can't take the title of Princess away...not after her father is dead unless her brother did it but that would be on your prerogative Touhoure. 

And Elizabeth Tudor was the eldest daughter of the last King...King Edward I believe, who married Henry Tudor to end the War of the Roses...she wasn't a bastard but a legitimate heir even though she had younger brothers...and if we're going to be super technical about it...doesn't the line get passed along to the male anyways? Even if she was older it wouldn't have been given to her because she isn't a male. And the King always names the Queen or Queen Regent...doesn't he?