I think you're talking about Suzie Cottrell.
She made a minor splash as an attractive twenty year old back in the late seventies after she appeared on The Tonight Show and performed a card effect that left Johnny Carson stumped. It would have been pretty unremarkable had she not claimed the feat was a genuine demonstration of paranormal ability.
The act consisted of predicting which card would be selected from among a deck she haphazardly scattered face down on a table. It went something like this: After shuffling the deck, she slid the cards on the table surface with her hands and had several of them pulled out by an audience member who then helped her eliminate some. Her written prediction matched the remaining card. Of course, like any good paranormalist, she augmented her credibility by missing every now and then.
Her dad, convinced of her extraordinary powers, asked CSICOP to test her, which they happily did. Their conclusion? It was simple deception using things like peeks, a Schulien force, and a sizeable arsenal of outs to wrap things up neatly at the end. Despite such chicanery, she bombed. The mutually agreed upon conditions made it difficult for her to attempt any jugglery during the actual testing. Expert magicians who were brought in saw to that. They, more than anyone else, understand the wisdom of Mr. Dooley's admonition to "trust everyone, but cut the cards".
You can read more about it in James Randi's book Flim-Flam!. The whole story is detailed, along with some incriminating screen caps from video footage they shot of her performance.