From Carnival's FAQ on their website-
Casino:
Guest must be 18 years of age or older to play the tables and the slot machines. Guests under 18 years of age are not permitted in the casino.
Lounges, Shows, and Disco:
Guests under the age of 18 should be accompanied by an adult in all public areas of the ship. Guests under the age of 18 must vacate the disco by 11 PM.
And this-
15 - 17 year olds have a place all their own as well, it's called Club 0 2. This program, like Camp Carnival, was created for these older teens it was designed and dedicated to our guests in the specific age groups. The older teens get a chance to show off during a Karaoke session, pool parties, late night dances, outdoor sporting events like basketball and ping pong.
But I could not find anything on if she CAN'T be in the teen club. Adults are allowed in there and since she can't be in the adult casino past 11, I assume they would allow here to go the the teen disco...
Hope this helps. no, they don't "organize" anything for that age group, but there will be plenty for her to do.
CCL Fantasy 1990
CCL Celebration 1995
CCL Victory 2005
CCL Conquest 2005
CCL Spirit June 2006
NCL Dream October 2006
RCCL Mariner OTS June 2007
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Booked on Victory June 2009 - Southern Caribbean!