You should be fine, especially if you get there as early as possible although it did take a while to see her. When we saw Mulan last year she took a lot of time to talk everyone. My daughter is Chinese and Mulan was just lovely with her. She talked to DD for several minutes and gave her a kiss on the cheek that left a beautiful lipstick mark. We were both thrilled.
Change the ADR to noon if you can't so you won't worry about it but I really think you can make it by 11:45.