Rollercoasters and Epilepsy?

My bestfriend has Epilepsy. She has only had 2 seizures , one in February and one in May. (Both in her sleep and both were tonic clonic seizures) The first one, was brought on by stress (from Bullying) and the second was from her botox. For her CP. She is on the highest dose of the medication , and it has worked very well. The doctors said they don't see why not but is it a high risk.? We plan to go to Canada's Wonderland and she went on a spin ride like the Scambler(From Centerville or any typical fair ride) the other day and was fine. Also, I know that Thunder Run is out of the question...due to the lights but is there anyothers that may pose a danger? Possibly that spin fast enough for the eyes not to recognize people or objects, because it may send light like signals? Thanks for your help in advance.