My sister had the same problem with my niece when they went a few months ago. They were only there a few days, and only went to MK. BUt if it was the dark or loud, it scared her. She's kind of extreme though.
Based on her experience, you may have a problem on a few rides...
Mickey's Philharmagic (dark and loud)
Peter Pan (dark)
Buzz Lightyear (parts were dark and loud)
Tomorrowland Transit Authority (goes into Space Mountain)
Monsters Inc. (She was scared of Roz)
Pirates of the Caribbean (dark)
Jungle Cruise (cave)
Tiki Birds (dark)
Needless to say she wasn't a huge fan of the fireworks either.
My sister came home and said she spent a few thousand dollars to meet princesses, and ride only Small World, Tea Cups, Pooh, and the Tomorrowland Speedway cars over and over.


I'm sure she's exaggerating, but not by much.