Hi there, Lauren!
What a lucky lady you are! It was so nice of your mother-in-law to give you this very kind gift, and I hope you'll have a fantastic time.
Once you make the RCI exchange into a
Disney Vacation Club reservation, you will indeed be able to add a
Disney Dining Plan to your reservation. You can call DVC at
800-800-9800 in order to add the plan, and it has to be done at least 48 hours prior to your arrival. The dining plan also has to be paid in full at the time of purchase.
Once you've booked your dining plan, don't forget to start planning any
Disney dining experiences you want to enjoy. You can book them 180 days in advance, and some of the more popular restaurants do book quickly. If there are any experiences that are must-do on your list, book them as soon as you have some plans in place.
Have an absolutely magical vacation, Lauren!
Anna