I wouldn't worry about it Wendy. CP is pretty accomodating with their rides. There may be a few rides that she may not be able to ride. She probably won't be too restricted as to what she can ride. 235 lbs isn't that bad of a weight. Her height is fine at 5'7" and she won't have any trouble riding any coaster because she'll be tall enough for them all. Before you get in line for the big rides like Wicked Twister, Raptor, Millenium Force, Top Thrill Dragster, etc, try out the test seat they have. Not all rides have them, but the ones that do, just have her try them out. The test seats are located right by the entrance to a ride. That will save you some time in line if she can't get into them. She'll be able to ride many things so don't worry about it and have a good time. CP has 16 coasters and she'll be able to ride way more than half of them, if not all of them. Enjoy your first trip to the point.
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and remember, if you can't be an athlete, be an athletic supporter