Pins are not transferable, so you would not be able to keep your discount and pass along the discount to someone else.
However, for future reference, you can book up to three rooms on a discount.
So you could re-book your trip with the discount, and link her room to the ressie and get the discount for both rooms.
You can find alot of information regarding this and more at the discount codes and rates board at the top of the resort board.