My DS8 and I LOVE rollercoasters -- Rock n' Rollercoaster is our favorite ride at WDW! -- but we both really did not enjoy ToT at all. We tried it out when we were there last year and, although we enjoyed the atmosphere of the ride, the repeated dropping was not pleasurable at all. I got off that ride feeling very unsteady because I'd been bracing myself the whole time trying to avoid that stomach-dropping feeling!! Anyway, what I'm getting at is just because your DD likes rollercoasters doesn't mean she'll like this ride. If she's the type who isn't afraid of a spooky atmosphere and also enjoys that dropping sensation, however, she may love it! In my family, the only one who likes this ride is my DH... It's sad because no one else will go on it with him!!
Have a great trip,
Sarah