Imagine how she must have felt as a girl about twenty who went from bring a Princess Royal to a bastard. Required as Elizabeth later was, to live daily in fear of her life. Birds in gilded cages. Not to let loose, not even to be killed while Henry continued his quest for a male heir. Then come Edward and living under the rule of a child tyrant, himself the pawn of his relatives. It is amazing that either girl was able to retain her sanity, and why each was warped although in different ways.
All older girls in the British royal family get to be heir, and wait for a male to be born, or not.
Think of those who are born bastards, like Edward IV, who later were elevated to the purple.
They are all mad. Can’t not be.