Cake hotline: 407-827-2253
Grand Floridian: 407-824-3000
I would order each child a slipper of her own because they aren't really big. I would have this be the dessert of a meal. You'll have to call Disney Dining (407-WDW-DINE) to see about getting a ressie for your date, and when you talk to the cake people, get the current price because I'm not sure. I think it's around $15 per slipper. Order the slipper desserts up to two weeks in advance, but at least 48 hours. Hope this helps and have a great time!
-Dorothy (LadyZolt)