Welcome StellaMoosh! My daughter will be almost 13 at the time of the cruise, but b/c she will still be 12 she will still have to go to the Edge (ages 11-13) and not the Vibe (ages 13-17). If your daughter is interested though, my DD would be happy to exchange emails. She practically sleeps with a laptop, a cellphone, and an ipod on her bed - so she's very good about returning messages.
Fish extenders are a lot of fun. You can do a search on the main dis boards and get lots of info and photos. Basically you've probably noticed the metal fish hanging outside each stateroom door, and those who participate, through this board, will hang a pocket from the fish (google 'fish extender images'!) and we all deliver goodies to each other during the cruise. You can make one delivery or several, spend a few dollars or much more, it's all up to you. There really are no strict rules. It's so much fun to return to your cabin and see 'mail' in the form of candy, key chains, pens, pirate stuff, dis stuff, stuff from people's home state, the list goes on and on and on. Some people make things and others buy. It's all for fun, and a lot of fun it is!
Others here can give more details as well.....
Cindy