I'm sure opinions will differ greatly, but it's pretty jerky, IMO. If she avoids roller coasters (which sometimes have a back that you can rest your head on to minimize jerkiness), then I would avoid this as well.
I don't think it's super jerky, but I also don't have neck or back problems.
The whole vehicle moves and reacts to stuff on the screen, so it can be bumpy if your going through a bunch of meteors or something, and sometimes it throws you forward a bit. But I don't think it is too rough.
It is less bumpy than it used to be before the recent re-imagining, IMHO. However, it is still a simulator. Unlike a roller coaster where you can see the track and predict which way your body will be thrown, you really can't tell which direction the simulator is going to go next. So you can be thrown off guard a little and have your body flung around a bit.
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