Answers:
Can she? Yes. Should she? Absolutely not. She will likely have a miscarriage. It would be in the best interests of the unborn child AND the mother to not risk riding these roller coasters, especially the Rock 'n' Roller Coaster which has numerous loops. Not only could this harm the unborn child, it could harm the expectant mother as well.
Here's a link for the theme park section of the Walt Disney World website...
http://disneyworld.disney.go.com/wdw/par...
Click on one of the four parks, click on one of the attractions, scroll down a bit, and read the Additional Details. Any rides that are unfit for expectant mothers will say this:
"For safety, you should be in good health and free from high blood pressure, heart, back or neck problems, motion sickness, or other conditions that could be aggravated by this adventure. Expectant mothers should not ride."
Here's a link to another Walt Disney World website with a section especially for expectant mothers...
http://allearsnet.com/pl/pregnant.htm...
She can still enjoy the Walt Disney World theme parks while pregnant. While you're riding Space Mountain and the Rock 'n' Roller Coaster she can wait for you on a nearby bench, relax, and imagine how wonderful it's going to be to bring her child there someday.
Hope I could help!
* And actually, just to correct the ditz below (ditzychik), they can stop you. If it's visually obvious that she is pregnant or she mentions it, they have the right to not allow you on the attraction. This is endangerment to the unborn child. If the Cast Members at WDW allowed a pregnant woman onto a ride that was unfit for her condition and she had a miscarriage, this could really hurt the Walt Disney Company's reputation. I doubt they'd even risk it.
ditzychik - so your fiance knew about all these women endangering themselves and their unborn children and he didn't do a thing about it? How pathetic! Hopefully, he'll care more for his own children's well-being if he ever has any. And as a Cast Member, you should know - a woman who's nine months pregnant won't even fit properly onto the attractions that are unfit for pregnant women, like Space Mountain, Rock 'n' Roller Coaster, Expedition Everest, etc.
Yeah, use your common sense. The shoulder restraints go past the shoulders just below the chest and to the stomach. Yes, the size of your stomach can affect whether or not the shoulder restraints will fit properly. Believe it or not, I've been to Walt Disney World before, and I have seen heavier set people fit on the rides. However, I also saw a man escorted from the Rock 'n' Roller Coaster Starring Aerosmith because the size of his gut wouldn't allow the should restraints to fit comfortably. I don't disagree that a Cast Member could force the should restraints or even a lap bar over a nine month-pregnant woman, but I'm pretty sure it would be uncomfortable and even painful for the expectant mother.
lol Walt Disney World needs to do a MUCH better job selecting their Cast Members. "The restraints that go over the shoulders have nothing to do with the stomach." LOL Are you kidding me? That is the most senseless thing I've ever heard. It's hilarious.