Sorry the online videos didn't help very much. please check with her Doctor before you leave for vacation. I would imagine he will be able to give you the best ideas, most Dr I know love amusement parks and will know best. Due to some medical problem my limitations are similar to hers right now and this is what I did. I would avoid Spider-Man, Dragon's Challenge, Ripsaw Falls, Forbidden Journey, Hulk, Bilge-rat Barge, Storm Force, Gringott's, RRR, Twirl and Hurl, Men in Black, Mummy, Simpson's, Transformer Ride, Woodys Coaster. They all have jerky motions, spinning or Gforces. The most tame of these are probably the water rides, Mummy and Simpson's (if you want to try them first)
Not so sure about Dr. doom Fear Fall, Flight of Hippogriff, Cat in Hat, Jurassic Park River Adventure, Pterandon Flyers, they all have a little movement or G-forces. Maybe you or someone can ride it first: just keep in mind you are to focus on the movement of the ride-not just the fun factor. She will probably be fine with all of these
You should be fine with: High in Sky Trolley, Hogwarts Express, 1fish,2fish, Shrek 4-D,Despicable Me(maybe do stationary seating first), ET, Caro-Seuss-el, Terminator 2-3D show
Don't forget the shows, parades and playground areas: Poseidens Fury, Sinbad, Jurassic Discovery Center, Blues Bros show, Fear Factor, Animal actors, Horror Makeup show, olivanders wand show, frog chorus, etc
If she is into Harry Potter an interactive wand would be great. Lots of spots to do spells. Butter beer, pumpkin juice, chocolate frogs, Leaky Cauldron and Three Broomsticks are fun. There is a lot to enjoy not just the roller coasters. At 9 years old she will have lots of opportunities to ride roller coasters so maybe err on the side of caution this year.
Have a great trip!