Crystal - you can go over to a certain popular social media site where all of this is being organized, but they did close down the FE a couple weeks ago along with other activities. I can't post the link here, but if you go to F______k, just look for a closed group titled Disney Fantasy April 21, 2018 Eastern Caribbean Cruise and ask to join.
We are sailing with our 12yr old DD as well and some of the girls of the same age have gotten a chat together on WhatApp, let me know if interested.