You don need an ID to purchase something.
Just tell them you walked to the store and left your ID at home.
And you seriously fucked up by letting her keep your card, Thats just telling her your a carder.
If you were truely the card owner, you would of been outraged when they took your card.
But since you let them keep your card, they will review the tapes, send the card over to the cops. And if your super unlucky (and i mean SUPER unlucky) they'll put your face on the news or grab your fingerprints off the card.
If the transaction was approved, why would you let them keep the card?
That was a huge mistake.