Mel 6197,
I don't know for sure the answer to your question, but I would guess Mission Space might be a mistake for your daughter. The ride puts you in enclosed pods from which you hang down, sort of like a ferris wheel on its side. The wheel starts spinning slowly, which apparantly you do not perceive, because the video screen in front of you shows a stationary scene. You are then tilted backwards and somehow this combination of ever-faster spinning and tilting gives you the impression of "takeoff" and then space flight. My husband, who is a former Navy pilot, seemed to understand exactly what the ride was doing to you and he told me it was very important to look at the image on the video screen the entire time, or your vestibular system would get very messed up and you'd likely feel motion sickness. The castmembers loading the ride seemed to be emphasizing the same concept, so I asume this is pretty important. I think that even a person not prone to motion sickness could start to feel sick on this ride if there is too much of a disconnect between what the eye is seeing and what the inner ear is detecting. If the brain can "make sense" of the motion based on what the eye sees in the screen, I think the chances of motion sickness are greatly reduced. Now take what we are saying with a grain of salt, as were are just tourists like yourself... But I did not dare look away from the screen (and I too can spin and spin on rides that leave many people queasy)!
By the way, we had a great time on this ride. It is not scary but was very physically intense and very different from anything else we had ever ridden. Neither of us are at all prone to motion sickness but I am a very big chicken about thrill rides (fear of heights) and had no problem with this ride. Ride it yourself if you dare, but consider steering clear with your daughter.
Have fun!
Beatnik