Guesses?

Shayla decided what she wanted to be for Halloween in July! It's almost that time. Her costume is ready. These pictures should give you a big hint. Any idea of what/who she'll be dressed up as/like for Trick or Treat next week?
Another Hint: She's been really into this since January 2008. Like Christi did at nine years old, Shayla decided this summer what she wanted to be for Halloween. These pictures might give you a clue as to what the theatre girl wants to be for trick-or-treat night. Any ideas?