It's a wonderful attraction, a must do for a Titanci enthusiast for sure. Plan on two hours. Non Titanic enthusiasts will most likely find it very interesting too. This was true when our extended family group of 10 went. It was a big hit with everyone (ages 13 to 72 at the time).
It's quite similar to the artifact exhibits that have been traveling around (the Traveling exhibit is at the Henry Ford in Dearborn, MI right now) and the more permanent (five year lease) artifact exhibit at the Luxor in Las Vegas. It's also similar to some of the other Titanic museums such as the ones in Branson, MO and Pigeon Forge, TN - a sister museum to the Branson one. Most people if they have done one of these, that would be enough and is all I would recommend for anyone except a huge Titanic enthusiast. I don't know if you have been to any of these others. If not, go to the Orlando one for sure.
One thing too (very nice touch in my opinion) that sets the Orlando one apart from these others, making if my favoite probably, is that you receive a guided tour (not just a self tour or head set option). Your tour in Orlando is in fact done by an actor in period costume with accent etc.
Anyway, I highly recommend this attraction if you haven't done one of the other similar ones before. If you have done one or more of the others and your daughter is still interested, someone might want to take her -- but much of the experience will be a repeat.
For the true Titanic enthusiast, anything worth doing is worth doing to excess lol. DS is a huge Titanic enthusiast by the way (has been facinated by the history for years / read so much on the subject / loves all the movies and documentaries), so I've gone with him to the Orlando one three times (three different trips). We've also been to the Branson museum three times (just four hours from our house), the traveling exhibit when it was in Indianapolis (once for that) and the exhibit at the Luxor twice when we've been in the Las Vegas area. It's amazing how almost everywhere you travel there is something Titanic around. We stopped at the Titanic memorial when we were in Washington D.C., stopped at the Molly Brown house when passing though Denver on our way to Keystone, CO to ski last Christmas, stopped at the old port where Titanic would have brought people if it has made it to New York -- abandoned -- nothing there except the old White Star sign (something DS really wanted to see), This summer after visiting relatives in New Jersey we are taking a five day cruise out to NYC to Canada. One of our port stops is Halifx, Nova Scotia. There we will visit their maritime museum that has a whole floor dedicated to the Titanic. We will also visit the Titanic graveyard in the city(take an hour and a half grayline tour). I've heard 121 of people who died at Sea are buried there. Just mentioning some of these things in case travels with your daughter bring you to some of these other and you would be interested in seeing some of these things too.