Yeah, problems with kids on rides are generally more due to theming and story than the ride movement. Dinosaur is all about the scary, and it terrifies some adults. It's dark, it's loud, the ride vehicle bangs and shakes. Very large, very toothy, very realistic dinos lunge out of the darkness at you.
Is it possible she'll still have fun and not be scared? Sure, lots of kids her ago do. But I just wanted you to know that it's not cartoon-y, cute, friendly dinosaurs. It's big nasty gonna-eat-you dinos.