I also have a sensitive neck. I would skip Matterhorn for sure. I still ride it, but it usually makes me sore the rest of the day!
Racers is pretty smooth! The first part when entering the building might bother her, as the car kinda goes fast. And then the actually race is smooth.
Goofys sky school is another that might hurt. I do ok on Incredicoaster because I keep my head back the entire time. Space mtn I also do ok with and it’s one of my favorites!! Rise is very smooth and I don’t have issues on that attraction. Indy is very bumpy. I try to relax my neck as much as possible on it and I do ok.
I would maybe watch some ride videos to also give you an idea. I hope you both have a great time!