My audition was very similar except we were measured after the first cut. Princesses range from 5'4 to 5'7, although the will "adjust" your height as they see fit. Also, my advice would be to wear makeup. Not heavy, but enough to enhance your features. Foundation, blush, mascara, and neutral eye shadows would be acceptable. And be confident! Even if you aren't the greatest dancer PRETEND you are. The acting involved telling the story of the role you were 'selected' for after the first cut. It is fairly simple and they give you some time to prepare so don't be nervous.