Are you an authorized user on the credit card?
That makes it tough because a credit card will not release any information to an individual who is not an authorized user on the credit card.
The flower shop probably will not release the order slip, because you are not the individual who placed the order.
All I can think of is have a friend (man) call the flower shop to dispute the amount that was charged to the credit card. They will probably ask you to confirm the credit card number information (if you have it). Request that they email or fax you a copy of the flower order to compare.