You may be surprised at how 'unshy' your DD may be! I was worried about this too with my DS8 (but not with my DD6). Before the trip he said ' I don't want to see the characters', 'I don't want to get autographs'. All talk - because he was shy and didn't know what to expect. Well, let me tell you, he turned into Mr. Anticipation and was bouncing in his seat waiting for characters to get to our table! In the parks he would grab MY autograph book! He was not much of a talker but his energy got the characters going.
I (being the adult) was also nervous and felt a little foolish. As we stood in line for Queen of Hearts we could see how 'demanding' she was of her fans. My kids chickened-out. I stood my ground, and conquered my fear! I didn't...no, couldn't say anything, but I did get my picture with her.
Your DD will have a GREAT time...don't worry.