Or, maybe she actually had a bump naturally in her hand that resembled a coin. You vanish the coin and there is the bump...Memory and hindsight of magic oftentimes plays great tricks on our spectators. This memory can make legends out of mediocre magicians.
Also, lest we forget, Criss Angel does the one where you see the coin under his skin, then it move across his body and down his arm where he cuts it out. There's lots of blood and the coin that gets cut out from under his skin was signed - there it is!
Young Mr. Kras wrote:No. That does not exist.
Thank you Michael for sharing the vast knowledge of, lo, your many years on this earth. I only wish that at my age I had a scratch in the surface of your complete, encyclodpedic knowledge of magic. I now feel that I can sleep tonight knowing that you've given your ruling on whether or not this trick was done by anyone, anytime, in the history of man.
Mike.