As long as she can handle the waiting in line then she should be ok. My advice is when you arrive to the park go with her to guest services so the can give you a paper for the return times. What you do is go to each ride and they'll give you a return time to come back and ride that roller coaster
It depends on the ride. Some rides you must have a harness that pushes down on you and you cannot ride with certain casts above the knee since it compromises the hold. On the map it will show you which rollar coasters are handicapped friendly and you can ask any of the friendly workers.
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