Obviously it depends on the child. But it wouldn't hurt to try and mentally rank the more intense rides to gauge her reaction.
Goofy's Barnstormer is the prefect introductory rollercoaster. It is very short, but does accellerate to a brisk pace and has some tight turns. If she likes that, move on to Big Thunder Mtn Railroad. Space Mountain and RNR should only be attempted if she passes rounds 1 and 2 successfully.
I think Test Track is also one of the tamer "E Ticket" thrill rides, aside from the fast accelleration at the end.
Star Tours is a fairly tame motion simulator by today's standards. If she's familiar with Star Wars, the theming may help put her at ease. The other motion simulator--Body Wars--is MUCH more intense.
Splash Mountain--many can't stand the thought of that huge drop. Let her decide.
Tower of Terror is also a tough call. As an adult, I think it's a blast. And it really isn't all that intense. But, as CRCrazy said, the ride theming is very intense. You can give it a try and still dash for the exit before you ever get into a ride car.
Dinosaur is, IMO, a VERY intense ride. Fast starts and stops--frightening theming. This is the one ride that I would arbitrarily cross off my list. My son will probably be 8 before I let him on that one.
Take it slowly and don't force anything. That's the one way to guarantee that you will traumatize her is if you force anything for which she is not prepared.