She might be available after the show in front of Cinderella's castle at MK - that is, if they're still doing that show...
She might still be in the parade at MGM/DS, maybe at the end she would be available as well?
There's a great Mulan artwork on one of the buildings at MGM - it's one of my favorite things to go see there. I think it's in the animation studio courtyard area. I love to take a picture of my girls with the artwork in the background. It's up high, so some creative camera angles need to be used...
Schmeck, who loves Mulan the best as well (Stitch is a close second though, LOL!)