I just read the wikipedia article more carefully. Her mental retardation before the procedure is highly disputed.
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She was not mentally retarded. … It could be she had an IQ of 90 in a family where everyone was 130, so it looked like retardation, but she did not fall into IQ 75 and below, which is the definition of mental retardation. … There is no way I can picture her at less than a 90 IQ, but in that family, 90 would be considered retarded.”
Rosemary Kennedy was considered mentally retarded before the operation.
That is, her intellectual prowess (or lack thereof) was a pre-existing condition.
(edited for clarification)
I just read the wikipedia article more carefully. Her mental retardation before the procedure is highly disputed.
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