She says "never cheated". I think that's a fairly clear and umambiguous statement to be honest. It encompasses "I never took a banned substance" because that is cheating. It includes "I never blood doped" because that is cheating. It includes "I never fiddled a test" because that is cheating.
She doesn't need to give a list of things she didn't do. She says she never cheated, and that means she never took anything or did anything which is prohibited.