You can add a guest at check-in as long as you've not exceed the max for the room, but you *cannot* add the DDP. If the guest is added at check in, you'll have to pay OOP for her meals. They are now counting the number of guests on the dining plan at TS locations also- so if there are four guests at the table but only 3 listed on your card, then you can't use an extra credit either. If you know this guest is coming with you, then why not add her at 48 hours prior and pay for the DDP then?---Kathy