I think you have been lucky that you have always been positioned in the car slots to get done first, as we have not always had that happen when I am ahead of DD in the TT or RSR single rider line. I usually go first, DD 2nd and DH behind her. More than once at both TT and RSR, they have pulled me and put me in one of the car line up slots where my group was lined up behind another group who was getting the next car, and my group would be in the round of cars that came through after that. DD was then pulled and immediately put in an empty spot in a car, or in a slot for the next round of cars so even though she was behind me, she went with the first round of cars and I was still standing on the platform watching her drive off while I waited for the next set of cars. So, OP I would say just be sure that your DD knows that even though you are in front of her in line, that does not mean you will definitely be off the ride before her, so if she doesn't see you in the photo area, she needs to stay put until you get here.