Maybe Anna sings for the first time the magic song discovering her powers. I don't know. But I think I maybe will be going to make a story-comic about this idea but it will be a different version. What do you think? Should I make it?
Jack and rapunzel never knew about Elsa's powers. When Anna was fifteen the parents went to visit rapunzels parents. On the way the was a big storm and the ship sunk. Jack didn't died (he is immortal) but rapunzel did. Jack feels sad and begins to sing the flower-song and flys away. He didn't saw how rapunzels hair begins to glow and how she opens her eyes.
Her hair always make her immortal. Even when somebody cuts it, it still has his power. Jack thought that the hair just make rapunzel young for eternity. But when rapunzels dies and you sing the song she will be alive again. The flower never loose her power!