First time teen
Both of my children were born and raised on board, so by the time they hit 14 they were really ready for the land locked life and tired of moving about and having to say goodbye to friends. They were both avid readers and at that age, my son would fish and my daughter would throw the fish back in. If you can find a family to buddy boat with and have radio contact it is better. 26 feet is very small for a teenager. Our last and smallest boat was 44 feet and I learned that any boat was too small.
All that said, we have friends whose children at that age were so envious of mine and wanted only to take a long voyage. So I agree with the others, take some short weekend sails and see how it goes and how your daughter likes it. Taking a friend along helps. My kids had each other and I can''t imagine how much work it would have been with only one whom I would have to entertain. They interacted with each other and today as they prepare for college they are extremely close.