What kind of actress may the casters of the Silver Chair be looking for to play Jill Pole?

I am interested in auditioning for the role of Jill Pole in the fourth Narnia installment. But I am not quite sure if it is even worth auditioning for if I won't be what they are looking for. I am tall about 5'11" thin with blonde hair and fair skin. Probably European looking. I also am a more serious actress, basically meaning I would not audition as a silly or " appeal" kind of girl. Although I surely hope they would not want such an actress to portray her. But I am concerned with my height and age of 16 but the actor who plays Eustace which is Jills age is actually a few months my senior. So would it be worth auditioning? Also, what kind of young lady do you think they would be looking for? Thankyou!