Song of the Sea and Ingo

Warning! This idea contains spoilers for the end of Song of the Sea, so if you haven't seen the movie go watch it before reading this.

At the end of Song of the Sea when Saoirse sings and all the Fairy creatures become free to pass to their world (this includes Granny Carne) the Mer are also able to pass from the human world as well; Sapphire is with Faro when he feels the pull and Sapphire feels it as well, due to the balance of her blood Sapphire can either join Faro and the rest of the magic-folk in their world or stay in the human world (if she stays in the human world se will no longer be able to go to Ingo or communicate with sea creatures since Ingo will no longer exist due to all magic-folk leaving the human world). So Sapphire is faced with the choice of staying and loosing her connection to Ingo and Faro, or leaving with the magic-folk and never seeing her family or friends again.