If she is big on Princesses, eat at Ariels' Grotto in California Adventure. You start out by getting your picture taken with Ariel, then as you eat they announce each princess coming out and they go around to the tables aigning autographs, taking pictures, and talking with the kids (and some adults too), the food there is really good and its honestly my favorite. Surprisingly it is my sons favorite too. He flirts with the princesses. Beacuse of his autism he doesn't conenct with the characters in the park so much but boy does he light up for the princesses, he says Jasmine is his favroite.
It also depends on what she is into. You say you are going to
Disneyland California, do you mean you are going to the Disney Resort in Califrnoa or just the Disney California park only? there are two separate parks there, Disneyland and Disney California ADventure.