Hi Stacey,
I'm so glad you've come to the Moms Panel, I hope I can offer some support and encouragement about taking your first Disney cruise!
First of all, planning a cruise can seem extremely overwhelming and intimidating especially for the first time cruiser. Let me assure you, a cruise is actually the easiest vacation to plan because the "hard part" is taking the leap and booking it (and of course paying the bill). Once that is done, the rest of it is amazingly streamlined from the transportation to the ship, to organized activities or on-shore excursions. Disney Cast Members are present every step of the way to ensure that your vacation is as stress-free as possible.
Once of the nicest things about Disney Cruise Line is that they have a firm grasp on families and all of the dynamics this can encompass. For this reason they have designed activities that are sure to please just about everyone! To get an idea of what types of things may be available you can use this
Onboard Activities Search to see some of the current options. Although the Disney Wonder and Disney Magic do not have rock climbing walls or skating rinks, they have a designated Teen Club, Aloft, where your daughter can make new friends and enjoy a variety of social activities throughout the day. They actually invite and encourage the teens to provide their input into the programming options. Of course there is always swimming, movies, dance parties - all kinds of things to keep her entertained!
You can absolutely tie your cruise vacation into a Disney Parks vacation, the the Walt Disney World Resort is about 60-90 minutes from the port and you can purchase a bus transfer between the two.
I hope this helps, good luck with your decision!