Wouldn't do credit cards with just anyone that she doesn't know well. It should be reserved for those who she feels comfortable with, since the nature of this business is trivial and the moment you decide to cancel your credit cards, she's got a charge back.
Beware of ladies too anxious to get your credit card information.
It's a terrible idea to leave such a blatant trail as a CC transaction. Also do some research on the latest methods being used by PIs to track ATM withdrawals and think twice about removing large sums of cash on any given day.