I think starting with things like the Carousel, Teacups, Dumbo, Speedway, Aladdin are great ideas. My only concern with the People Mover and Buzz are that they are in the dark. She might be ready for them part way through the day but possibly not at the beginning.
My parents took my 6yo brother on Pirates at the beginning of our trip and that was it. He was done for all water rides! (Mind you, this was 40 years ago so nobody knew what we were in for.)
Anyway, I agree with videos if you're able to show her, choosing rides you can fully see and then letting her lead the way. She might enjoy Swiss Family Treehouse if heights are okay with her.