Its a very different ride than Space IMHO, but I think it is much smoother and less scary than space. The big thing is you can sit beside her and touch and reassure her if she is unsure AND it's over really fast if she does not like it. Oldest DS did not try it till he was 8 and loved it and little guy has not been back to WDW since he hit 48 inches but I'm not sure he will choose to try it next trip or not. It's loud (ear plugs may help), fast, and creates a feeling of being disoriented during the inversion but it really is a fun first true thrill ride.