I have a room booked for a 6 night stay, and plan to get a 7 day pass. I have one of my nieces listed on the room, but now she can only come for 4 nights. If I get her a 4 day pass, how will this work with FP+? Can I add her ticket and then just link FPs for the days she is there? Will it matter that she is joining me just for the end of the trip?